I currently only know these few:
Land = Your ship takes off and lands wherever you want. Note: this takes some time, depending on how far the chosen LZ is.
Fire = Your ship fires a weapon of your choosing at anything the ship has a clear line of sight to. Useful for thinning out pursuing hostiles. Not so much for mass mining.
Start = Don't really know much about this one. Makes your ship orbit the planet?
Rover start = Commands your rover to - well, start roving.
Rover stop = Opposite of ^
Rover target = I think this makes your rover go to a specific spot.
Rescue = I don't know. (Masterski mentioned this command in another thread.)
Please add to this list. There's no other place to get this information - the wiki seems to be a bit dated, and I search the forums for information more, anyway.