Oh ho HO ho (devilish laugh), allowing us to evoke scripts in response to certain events... Now that idea has merit!!!
Say, every time the screensaver comes on, it first checks to see if a actionscript is available for it and if so it runs it first, thus allowing you to do things when the xbox is inactive.
If you go to launch a game or app, it first runs any script associated with that even, thus allowing you to add statistical information for how often you launch what (and/or for logging purposes you nosey person you hehe).
Oh, a Shutdown event, to let you play like a windows style shutdown sound. I have this great one from homestarrunner.com. When I turn off my computer, strongbad comes up and says "It's about time, why don't you go outside or something.... NERD!!!" hahaha...
What other events could scripts be written for? I think that would rock...
With regard to the skin switching... I have only been a wip tester for a day and a half or so now, so don't hold me to anything, but I did have some stability issues when I changed it a lot without rebooting. A lot being say more than 10 times in a row. Now, I think if previews could be shown of the skins then people would not want change it quite so often in one sitting (unless you do make an automatic skin changer hehe...)
Anyway, just had to chime in on that one...