Elsewhere in the forum someone was asking for a new GUI for the Sonitus effects, not changing the audio processing, just updating the look. You could also make Pro-channel modules that use Sonitus fxs code, but look gorgeous and fit in so easily.
Then you can drag and drop settings between instances from different channels.

MARKER TRACK on top of the timeline where one can enter marker names like ”intro, verse, chorus etc...” and color them for easy overview of the whole arrangement/structure of the song would be awesome.

The current marker system is barely visible with only a little icon and small text and a workaround is to create empty midi track with midi clips with names but why not do it properly with a dedicated marker track... thanks

Major issue for may years: It's virtually impossible to work with external synth via MIDI while routing synth audio out back in Sonar, and mixing it back to mix "in the box" when using other VST instruments, audio tracks and VST effects. External synth audio track gets delayed and out of sync. Cubase does this without any problems. Should not be difficult to fix.
 
Details: my projects are audio tracks and VST instruments, combined with multiple MIDI tracks routed to external synth that is connected to Audio In of my audio interface. The issue manifests when I have many effects, including mastering effect chain on master output bus. My intent is to have MIDI tracks playing through the external synth, routed into a single stereo audio track in the project (monitoring on) to use effects on that track and to mix and master "in the box" in live mode, so it would go through the same mastering chain in master bus. However as soon as the effects are on - it plays out of sync, synth audio track is significantly delayed! I think what happens is that due to PDC MIDI is delayed by PDC, but then audio live input is delayed by PDC again, which results in twice the necessary delay by PDC. When I actually record that track - it syncs fine, and then I can mix. Mut I can't work when it's a live monitor. I also tried using "external input" plugin with the same effect. If I enable "PDC off" button other things fall apart, as PDC is necessary to sync everything. Cubase works just fine with the same setup.
 
Solution: If it can't work automatically, have a button or an option (on per track basis) that disables MIDI PDC delay for those tracks, so monitoring via audio track will work (with PDC working on that source just like on other tracks). 
 
 

Before Cakewalk's resurrection I had a chance to work with Samplitude X3 and compare both DAWs. Now I'm back and I can say what I really miss:
1. Possibility to set tempo/grid markers and drag grid lines left or right to change tempo of each bar.
2. In Samplitude I can add Melodyne to clip (ARA) during playback - I can live without it but it really saves time when I have to edit many vocal tracks.
3. To copy and paste a selection of tempo curve.
4. Very quick and simple change pitch of audio clip (called "object" in SX3) or whole track.
5. I'd like to set Recording Mode to "Sound on Sound" as default.

ekamis
5. I'd like to set Recording Mode to "Sound on Sound" as default.

Recording Mode is set in Preferences > Project > Record and stored in the project. The default value is stored in the project template. Alter the template and all future projects made with template will have the new default value.

Under 1 to 9 there are 9 screens you can change. It takes a while. If I change screens in Logic (using the num pad part of my keyboard) it's instant. I find this annoying. Sonar does not have HUI. I find that annoying too. The looping in het audio engine is not flawless. 
 
Fruity loops has great looping. If you add effects in Sonar the audio engine may stop. This does not happen in fruity loops. This should be fixed.

1. Chord track
2. Negative measures
3. Folders in Console view
4. MIDI loop preview: It's currently possible to audition audio loops (Acid etc) in real time while the project is playing. One simply browses to the loops and clicks them one at a time to audition them. They then play in tune with the project (assuming one has specified the project key correctly), and at project tempo. I would like to see something similar for MIDI loops. I want to be able to click a MIDI loop and have it sound via the synth (internal or external) of my choice, to hear what it sounds like in the context of my project. I do NOT want to have to load each loop onto the timeline to hear it. I understand that getting the MIDI loops to be in the correct key may be impossible in a preview, but it would be awesome if that were possible. Otherwise, just the ability to click a MIDI loop and hear it play immediately (in project key or not) would be a huge time saver.

Waveform Preview in Aux Tracks would be really great.

I'm hoping that the new forum will include a Feature Requests sub-forum, where the pro and cons of each individual proposal can be brainstormed in its own separate thread.

I have been a happy user of Cakewalk software since it was Dos. That's almost 28 years in my professional studio here in Nashville. In that time I've Produced and Engineered over 40 albums of all styles and tons of Demos for pitching in town. The main thing is that since Sonar X series Way Too Many procedures are in way too many places. If I'm doing odubs I Hate to be forced to keep bouncing around to different drop down menus. I should be able to move a clip around, trim that clip and adjust the volume envelope with Out changing the Tool or going to another drop down menu. We didn't used to, clear up thru 8.5. Sonar used to be The Best recording/midi software on the PC platform. Slow Tools is just beginning to do things Sonar was capable of 10 and 15 years ago. One of the most important things about the software is that it was so customizable. I took the 12 things I do all the time and assigned them to my "F" keys for 1 button access. The full Key binding list needs to be brought back. My.. Clone... Vol Envelope... Pan Envelope etc.. should be a lot easier to access when I'm working. Not on different drop down menus. Obviously the Programers who though that is a good idea have Never run a Recording Session. Not everyone out here is making music in our bedroom in our Mom's house. I have started looking at other Daw's. Because I actually went back to 8.5. But I need to upgrade. Fix Sonar and I'll be happy to stay. How the Program works is Much more important than some new plug in.