This is the way I see it. If there was some Hex command that would allow you to make the calculator run a ti-basic command on start-up, then basically all you would have to do is write the program containing the GUI and other programs, and you would have, in theory, a ti-basic OS. You might also need to:
@ Disable the ability to close the program with the ON button.
@ Create a way to download other programs with the link cable, manage, create, and delete them.
@ Turn off the calculator when the it is supposed to be turned off.
Basically, you could expand on the capabilities of the calculator and customize it to your needs. Anyone interested in this idea? Is it possible?