I think that ability to take abandoned guns like mg42 is a bit unfair. For example, there is a note on a gun that it needs at least 2 operators, but when a squad of 3 men takes it, all 3 become gun crew. I suggest that if such gun is taken by a squad of 3 men, one of them should remain as a squad member and the others become gun crew so that player won't lose the squad
Some guns as puphens, mortars and AT guns will lost from this decision. Because if 1 member will die, you again got abandon team weapon. Only if will do turn on\off for ability that will be allow you to decide 2 or 3 mens.
But IMHO all good players know what they want, and from such point of view this ability only increase difficulty of game (without any real advantages). Imagine situation - you taking weapon with 2 mans and after that get hit and lost your weapon, than you decide turn off this ability to make sure that in this time you not lost the gun. And you don't lost your mg, mortar or at-gun, because 3 man better than 2. And ability will be turn off all game, like cold tech. Because no one want to remember when he need to turn on or off this ability. Such ability have very narrow usage.