The case is not a single key works, but I’m hitting ctrl+grave, super+space and alt+tab, meaning to urxvt focus and raise, menu popup and window list on them correspondingly.
When the mouse is plugged in and I click either touchpad right button or mouse right button, it starts to work for a while - everything. But then ceases working again when I click Mouse 1, Mouse 2, Mouse 4 or Mouse 5… Than I click Mouse 3 and it starts working again.
As for April 2 2011 for Archlinux and Asus K50IN it’s solved with plugging in the mouse and running nvidia-xconfig. It would add a section for external mouse in a blink of an eye. Restart X and enjoy your mouse. )