Ai controlled helo or Human? Forgive me if Im wrong but in OFP I thought if you made a base of sorts and added AI Refuel and AI Rearm trucks near your helopads, when you landed or hovered low above either and used your scroll mouse you could refuel/rearm, but that was playing as pilot (human).
Ai controlled isn't hard either, tried setFuel command?
"vehicle setFuel amount"
(Descrition:Set fuel amount. Fuel 1 is full gas tank, 0 is empty.)
or reload command?
"reload vehicle"
(Description:Reload all weapons
also if you sync the trigger with the "vehicle", you have other options in drop down once its sync'd (vehicle, commander, any member of group, etc). As far as waiting to reload use the "min" and "max" on the trigger like min:10 mid:15 max:20. this means itll tkae as long as 20 seconds but could be as few as 10 secs.
hope that helps