it prevents me to use virtualbox usb features that would work out of the box just creating vboxuser group and adding myself to it (operations that could be done from get-virtualbox script, i think).
if i put "umount /proc/bus/usb" in /etc/init.d/local.sh virtualbox usb works well and i can't see anything wrong with normal usb operations.
would it be enough to put n in CONFIG_USB_DEVICEFS kernel configuration http://cateee.net/lkddb/web-lkddb/USB_DEVICEFS.html or this would produce an error in some script?
i wil try, but if someone already had the solution he would be welcome...