I'd love to see an all-in-one training mission that covers ALL of the in-game commands. It might take a while to run through, but the best way to learn all these would be to practice their use in the game environment without the interruptions of the missions where you're getting fired at with deadly intent!
Here's me, Mr. Total Newbie, going "Now what key combo calls the repair ship?" staring at the keyboard while I'm also attempting to waggle the joystick around to keep from getting killed.
(I haven't died yet! Playing on Easy so I assume I'd _really_ have to work at getting killed.)
Freespace 2 Default In-Game Commands Settings.
Targeting
Target Next Ship = T
Target Previous ship = Shift-T
Target Closest Hostile Ship = H, Button 3
Toggle Auto Targeting = Alt-H
Target Next Closest Friendly Ship = Shift-F
Target Ship in Reticle = Y, Button 5
Target Target's Nearest Attacker = G
Target Last Ship to Send Transmission = Alt-Y
Turn Off Auto Targeting = Alt-T
Target Subsystem in Reticle = V
Target Next Subsystem = S
Target Previous Subsystem = Shift-S
Turn Off Auto Targeting of Subsystems = Alt-S
Target Closest Attacking Ship = R, Button 7
Target Target's Target = J
Target Next Escort Ship = E
Target Closest Repair Ship = Alt-R
Target Next Uninspected Cargo = U
Target Previous Uninspected Cargo = Shift-U
Target Newest Ship in Area = N
Target Next Live Turret = K
Target Previous Live Turret = Shift-K
Target Next Hostile Bomb or Bomber = B
Target Previous Hostile Bomb or Bomber = Shift-B
Ship
Forward Thrust = A
Reverse Thrust = Z
Bank Left = Pad 7
Bank Right = Pad 9
Pitch Forward = Pad 8
Pitch Backward = Pad 2
Turn Left = Pad 4
Turn Right = Pad 6
Set Throttle to Zero = Backspace
Set Throttle to Max = \
Set Throttle to One-Third = [
Set Throttle to Two-Thirds = ]
Increase Throttle 5 Percent = = (Equal)
Decrease Throttle 5 Percent = - (Minus)
Afterburner = Tab, Button 6
Bank When Pressed = None
Turn (Yaw) Axis = Joystick/Mouse X Axis
Pitch Axis = Joystick/Mouse Y Axis
Bank Axis = None
Absolute Throttle Axis = None
Relative Throttle Axis = None
Weapons
Fire Primary Weapon = Left Ctrl, Button 1
Fire Secondary Weapon = Spacebar, Button 2
Cycle Forward Primary Weapon = . (Period)
Cycle Backward Primary Weapon = , (Comma)
Cycle Secondary Weapon Bank = /
Cycle Secondary Weapon Firing Rate = Shift-/
Launch Countermeasure = X, Button 4
Misc
Match Target Speed = M
Toggle Auto Speed Matching = Alt-M
Attack My Target = Shift-A
Disarm My Target = Shift-Z
Disable My Target = Shift-D
Attack My Subsystem = Shift-V
Capture My Target = Shift-X
Engage Enemy = Shift-E
Form on My Wing = Shift-W
Ignore My Target = Shift=I
Protect My Target = Shift-P
Cover Me = Shift-C
Return to Base = Shift-J
Rearm Me = Shift-R
Chase View = Pad *
External View = Pad . (Decimal Point)
Toggle External Camera Lock = Pad Enter
Free Look View = Pad 0
Current Target View = Pad /
Increase View Distance = Pad +
Decrease View Distance = Pad -
Center View = Pad 5
View Up = Hat Forward
View Rear = Hat Back
View Left = Hat Left
View Right = Hat Right
Cycle Radar Range = ' (Apostrophe)
Communications Menu = C
Enter Subspace (End Mission) = Alt-J
Increase Weapon Energy = Insert
Decrease Weapon Energy = Delete
Increase Shield Energy = Home
Decrease Shield Energy = End
Increase Engine Energy = Page Up
Decrease Engine Energy = Page Down
Equalize Energy Settings = Alt-D
Equalize Shield = Q, Button 8
Augment Forward Shield = Up Arrow
Augment Rear Shield = Down Arrow
Augment Left Shield = Left Arrow
Augment Right Shield = Right Arrow
Transfer Energy Laser->Shield = Scroll Lock
Transfer Energy Shield->Laser = Shift-Scroll Lock
Add or Remove Escort = Alt-E
Clear Escort List = Alt-Shift-E
Increase Time Compression = Shift-. (Period)
Decrease Time Compression = Shift-, (Comma)
Toggle HUD Contrast = L