iirc the medic/ammo here calls are made automatically when you throw an ammo or medibag.
talking to commander is "v" on default, and only SL's can do it. lemme see...if you spot something, ie "q" and right click you can select things like boat/plane/apc/sniper because the game will jump to "enemy forces" when things are out of visual range.
a thing I
only just found out :/ is that commander can zoom the tactical map and thus can zero in on assets / enemies for pinpoint dropping of supplies or arty.
on flying, well Fidge has the right of it. set your yaw and pitch things to waaaay high. I can now fly a chopper with reasonable incompetance but planes are a definate nono for me still. there are plane-ninjas out there though, it's so unfair for us ground-bound folk. luckilly the new patch has aparantly improved SAM lock (so I hear) so I look forward to destroying some of the 50+ kill streak buggers