You don`t have to smash the keyboard or move the mouse and stuff...
Install haveged, a simple entropy deamon.
apt-get install havegedthen type in -w with your bits:
haveged -w 4096Now you can re-start your PGP-key entropy gatherer in order to finish quickly, right after it's done, you might consider removing haveged as i did.
apt-get remove havegedEasy eh?