well i know you have tons of requests so lets rather make this a suggestion. customizable GUI! maybe that is not even possible but personally I don't like having a castle at the bottom left corner. Not trying to offend in any way but it is just a personal preference, abstract and slick are more my ways of a GUI.
Second suggestion would be to NOT make it a mouse interface. I really hated DoorCS because of that, it's completely inpractical, just stick with the Ti-os way of doing it, it makes going from Ti-os to k-os easier.
third: Command line interface? (I seem to recall that is already planned so my apologies if I bumped it)
It is a really really cool project and quite a challenge! I never installed OS 2 from BrandonW because it did not work for me...I don't think compatability is a issue really but just make sure it easily installs.
hang on to this! as well as tiDE! and your Axe guide

You have, just like me, lots of projects in parallel only that your projects are thrice as complicated. Just keep going at your own pace and keep us posted about (significant) progress!
Good luck!