Hi,
I want to report you my personal experience:

i installed kde and realized that a mouse would be pretty good.
So I read this thread and installed usb mouse 1.1.
I didn't install dbus script.
And everything works good: I have my wireless usb mouse working and internal keyboard works too (I have N810). KDE always shows cursor and now I have cursor even in default Window Manager (even if it works only in some parts of the ui).

Thank you very much for mouse support, even if it's a little bit cpu hungry. I think I'll buy Apple Mighty...