It would be very nice to see something similar to setWeaponReloadingTime, but instead of changing the round chambering time, it sets current magazine reloading time. For cases where you want a weapon immediately available for use, as some weapons go through the entire reload process when changing fire modes via selectWeapon or the "SWITCHMAGAZINE" action.

Possible syntax:

vehicle setMagazineReloadingTime [gunnerOrTurret,muzzleName,reloadTime]

Alternative or bonus:
Add an optional parameter to loadMagazine like:

vehicle loadMagazine [turretPath,weaponName,magazineName,instant]
or
vehicle loadMagazine [turretPath,weaponName,magazineName,reloadTime]