nope - no way to alter a player's unitpos in any way
You could setpos them instantly 2 meters above ground
how would that look like.
Nah - really now: hiding in a bush is what most of intelligent
human would do, once the first bullet starts flying.
make your CTF on desert island, AFAIK there are no bushes
to hide in, and digging in hasn't been implemented in OFP yet. ;D