Great suggestion! I downloaded it and checked it out with my iPad. Teamviewer does indeed work, but I need to look into it further...my main monitor is a 1920 x 1080 touch screen with a secondary 1280 x 1024 non-touch. The big monitor doesn't translate well to an iPad screen, and although you can pinch, it seems hard to move SONAR around. Also Teamviewer lets you access two monitors, but it seems to treat them as two isolated screens, not an extended desktop, because I can't seem to move windows from one screen to another.
However, if I put SONAR in the 1280 x 1024 screen and control it with the iPad, it's pretty amazing in terms of how well it works. It's easy to control the transport, create new track, arm for record, solo, mute, move faders, etc. (You'll also use the new Add Track feature, it makes things a lot easier with touch.)
This is just an initial impression, and there are things I haven't figured out (like how to zoom in, but look at a different part of SONAR). But this looks promising. It also seems like I might be able to use it for touch control of things I put in the non-touch screen, like VIs.