Wow, this is a great list! I definitely learned a couple of new things

Here are some more:
-You can shift-click on Retreat to have units automatically retreat home after performing an action. This can be useful when capturing team weapons, or for having low-health squads retreat automatically after capturing a point.
-It is
always cheaper to reinforce squads than to buy new squads.
-If you want you to destroy an abandoned team weapon or vehicle, order your units to attack it with an Attack-Move order (default hotkey: A, grid key: Q). This is more accurate than using Attack-Ground.