Hi,
I started using RadialMenu a few weeks ago and it took me awhile to figure how to set things up but the interface was a bit annoying and took me awhile to customize everything to my liking. Even then, there are still a lot of stuff I didn't enjoy about it that I won't go into details.
1.A must have feature for me is to be able to assign custom colors, write labels and create custom PNG. I like to color code groups of similar functions so that I can find the buttons much easier when I glance. I'm attaching a screen shot of what I made with RadialMenu.
2.A very cool feature it has that I absolutely love is that you can assign custom pads to each program.
For example:
I made a custom panel for Zbrush, when I open up Zbrush, that pad I made for it will pop up. When I minimize it, the desktop pad will appear and then when I maximize zbrush again, the zbrush panel will appear. So if I made one for photoshop, it would do the same. All I had to do was assign each custom panel to whatever software I want to use it for and it autoloads for me. Does Tablet Pro have this feature?
3. Capacitive feel to each button. If that is not possible, then how about sound for each button I press? Just clicking sounds, that way we can somewhat get tactile feel for each press.
4. A very cool feature to have is some kind of finger swipe slider. In the panel I did, if you notice I have a plus and minus button for Drawing. Instead of having 2 buttons for that, it would be nice if I can make a slider bar. TO increase size, all I'd have to do is swipe back and fourth to get the size. I feel like that would make the work flow faster. Radial Menu has that feature, but it was buggy or I didn't know how to set it up properly.
5. Docking. I want to be able to set exactly where my panel will be and then LOCK it. This is something that bothered me a ton in Radial Menu. I would dock it left, but my whole screen will get pulled to the right and I'd lose visibilty of any sort of icons on my desktop because it would be off screen.
When i don't dock it, the panel always changed place or it will be moved accidently and I'd have to relocate it. To me this is a huge issue because I work better by memorizing motion and location of my hands, especially when there is no tactile feel, it feels like an important thing to have.
That is all I can think of for now and actually are stuff I really want. Let me know what features you have or will have. I do plan on getting this software! Its a must have for me.