`(tilde): open console
1 to 9: select units
tab: cycle units
space: play/pause
←↑→↓: scroll map
W: replay
K: zoom in
M: zoom out

O: orders menu
E: engage on sight, rewind
T: add zone (unsure if usable by itself)
S: stand
D: duck
X: cancel aim
C: continue on sight
hold V: line of direct fire, weapon range
⌦: delete selected waypoint/order
⌫: delete last waypoint/order
=: delete last 10 waypoints, rewind

ctrl: line of indirect fire
ctrl + left click: check (doesn't work consistently)
shift + double left click: manual waypoint
T + drag left click: draw zone

left click: select, rewind
double left click: automatic waypoint
hold left click: drag unit/order/wayline

scroll: zoom/cycle units

right click: drag map/orders menu
ctrl + right click: aim
ctrl + double right click: cancel aim

Images taken from http://icebrain.free.fr/

If you have anything to add, please let us know in the comments.