The main key binds that a player will need to play this (my defaults in brackets)
Engines - Are running from start but could get stopped so a key for Stop / Start (Page-up)
Positions
Jump to Driver (numpad 1)
Jump to Gunner (numpad 2)
Outside view, called Iso-something? (numpad 0)
When in outside view which is behind and slight above tank you can zoom in to position yourself in a "commanders" view. If you go to outside view from the driver position you can look around without the turret swinging all the time.
Binoculars (B-toggles on and off)
This function has its own pre defined buttons, like L for laser, N for NVG's, Z for IR view etc
Zoom (scroll mouse wheel)
Weapons
Fire selected weapon (left mouse click)
Ammo Selection (E). You may see some tanks showing "depleted" from the start. Just use E to select next ammo. I have tried to configure each tank to have similar loadouts with similar initial reload times. Some times the default weapon was not right for this. Tanks have primary and secondary stocks. Once the primary is used up the secondary is used but load times take longer.
Weapon select for turret - main gun / heavy machine gun etc (Q)
Gun Stabilizer (if fitted) (V)
Gun Range Finder (if fitted) (L)
Gun sight zoom (if fitted) (right mouse click and hold)
Centre gun (when in gun sight view) (numpad 5)
Target Lock (if fitted) (not sure what I have for this-doing this post from work computer)
Movement
Handbrake (H toggle on and off)
Put tank in forward drive gear (X), gears change up and down automatically once moving
Put tank in reverse drive gear (Z)
Throttle up (W)
Cruise Control (T) - useful when travelling across country. Just hit T then its hands free.
Go Left (A)
Go Right (D)
Stop (S) - also clears cruise control
You will also need a key for Comms menu (same as planes) to get to the F10 "Other" menus