schlauchi - if you want to delete the files associated with a game, highlight the game in the fileselection menu and press the black button
re: USB adaptors/controllers - no this will not work on the XBox without some very low-level code being written. The XBox has XDK support for a select few proprietary items (xbox-specific joypads, keyboards, mice, etc). It would take a lot of time and effort to implement a new USB-controller device driver with no guarantee of success....and since getting USB controllers working on the XBox is not of any interest to me, it's not going to be me who does the gruntwork.
You could use that keyboard IPAC thing, but as of today there is no way to assign keystrokes to controller buttons in any of my projects. (I could theoretically do this, but it would take some serious restructuring and I'm not sure I'd be interested in doing this either for such a limited group of people.)
In theory if you had a hardware filter that sat in between your USB controller and the XBox that could parse the HID information and replace it with something usable from the XDK point-of-view (e.g. the HID information for a standard XBox controller), then you'd be all set.
re: USB hub for mouse+keyboard on same port - I said that in general HUBs don't play nice with the XBox. You must be one of the lucky ones that has a hardware setup that actually works. It is not software related - it's purely a hardware issue.