Loads of quality suggestions here already!
Another "lifetimer" here... I'm a long time Cakewalk user since early 90's. I'm using Sonar as the main DAW in my home studio for recording/editing audio and producing music, but recently I've done a great job on huge bulk of MIDI files and some advanced editing using CAL, that probably couldn't be done in other DAWs in such quick and powerful way. The only thing I couldn't do was to change a CC series of data to wheel/pitch data, or vice versa, something I think I could do in early Cakewalk Professional version (v2 or 3 I think), wish I had it back in SPlat. Anyway here are my 5 suggestions:
1. If you want to make CbB a DAW that pros (ie. those who do music for living) would want to build their studios around it, I think you should consider offline activation. Making it the main studio DAW means a long term relationship with the software, owning the activation key for future re-installs is essential, same with keeping the main computer offline, which is essential for many pros.
Keep the gui clean and workflow simple, to make the main tasks like quick arming/recording track(s), looping, navigate/zoom within a huge project with many tracks and clips, moving between song sections, markers easy and focused. Make it work with hardware controllers (like Avid Artist or Behringer X-Touch) like a breeze. Streamline the use of mouse wheel and let people customize computer keyboard to their liking. And then focus on powerful editing features.
2. Keep the MIDI features like CAL or MFx or groove quantize, add even more creative MIDI editing features. Again, add seamless integration with hardware controllers. Good scoring wouldn't hurt either.
3. Give us efficient loop-style workflow (think of ableton style) for EDM-type music creation, that will make CbB even more comprehensive.
4. Stability and bug-free is essential.
5. And make a MAC version so we can exchange our project with Mac users, or let us export in a convenient way for Pro-tools users, if possible to a session that they could import? Most pros work on Macs.