I already thought in something like your idea and i already created a similar software but developing alone with a lot of tests in the college, it's difficulty to return to develop again.

http://talk.maemo.org/showthread.php...t=MaemoControl

Now i think that N9 and N900 are so seamless that it's possible to develop a software for N900 and run it in N9 since the software be written in PHP, CGI or other server-side language.