What about Shift+Click orders 100 items in workshops?
Other alternatives are Middle click (all mice have it by now?)
Ctrl+click (not sure if we use Ctrl anywhere in the game yet, besides assigning units to a quick-selection)
KaM Remake at: http://www.kamremake.com
Original MBWR/WR2/AFC/FVR tools at: http://krom.reveur.de