If you are having difficulty with a mouse have you considered a trackball? I use a Kensington Slimblade for audio and video editing. Takes a bit of getting used to but works a treat:)
 
http://www.kensington.com/au/au/4493/72327/slimblade%e2%84%a2-trackball
 

I recommend getting a control surface e.g. the vs-700c which alllows you to control most features of sonar ...
I Have used touch in many ways since it came but was never satisfied ... There is no satisfactory fine adjustment of knobs and faders ... Well it works but using it really wears you out since its hard to get it right where you want to have to slider ...
 
I still it use but only for the following: 

• Start playback in live performances (backing tracks) but even there the play list feature and wireless keyboard are superior
• Arm tracks and push record during song writing session where we have big (!!!) touch screen mounted to studio wall ( but still you do not want to use for much more once tried that)
• Adjust pre-prepared live mixes on my x32 from a tablet ... But even that is less than satisfying because try changing a fader by 0.2 dB ...???

Overall disappointingly little use for the ££££ I have invested

Thanks very much guys! thanks for taking your time! Great informations for me!

I want to add to the mouse/trackball comments here to say I've recently added a second trackball (Kensington Expert trackball/mouse, whatever they call it).  It's helping a fair bit.  I especially like being able to hold the mouse button down with one hand, while adjusting a control with the other hand (think faders and knobs).  That action (adjusting faders and other controls) plus intense editing are the two actions that hurt my hands the most.  By separating the 'click and hold' from the 'move' actions, it's helped.  And, as you already know, just having the option to use either hand is a bit of a relief.  Since both trackballs are seen as one (I don't install the Kensington software), it isn't possible to switch the left/right buttons on either one without affecting the other, but this hasn't been an issue for me.
 
Also, this is the wrong thread (should be in your other one about control surfaces), but I want to give a shout-out to the Mackie MCU Pro.  Other than a couple of minor display issues (random characters that show in the MCU scribble strips), mine works just fine with Sonar X3e (and all X series).  I like to mix and automate with it, I like using the transport controls, save buttons, buttons for switching between tracks, buses and outputs, and more.  I wouldn't say I use it in a 'deep' way (haven't tried to use it for plugs or sends yet) but for the basics of day to day mixing, I'm very happy with it.  There are others with complaints on the forum about lack of integration or bugs, but that has not been my experience at all.  I use the USB port with mine, Win 7 64bit.

I like my touch screen. I do use it. I have only the one monitor. It is fun with a friend too.

Absynth besides the normal adjustment has a fine adjustment slider. Multi-touch implementation will get better as time goes on. http://www.native-instruments.com/en/products/komplete/synths/absynth-5/ 
the two or three sliders next to each function makes gross or fine adjustment. I love this feature.
 
Windows 10 will have additional functionality for multi-touch. Then I will alos update my computer and get a 32" multi-touch monitor.
 
Part of the reason I use Sonar is ARA for Melodyne and the multi-touch implementation. I recently also purchased FL Studio because again it has considerable multi-touch functionality and can run as a VSTi inside Sonar.

Thanks guys!! Interesting the idea of a second trackball!