This is expected behaviour. One may use a mouse and the keyboard at the same time. How could one choose priority? Not possible, a single keypress is a single event - even if it interrupted the flow of a mouse it would do so for only a very short time. [happens with desktops and mice too ;-)]
** Changed in: Ubuntu Status: Unconfirmed => Rejected -- touchpad doesn't disable while typing https://launchpad.net/bugs/55235 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs