I knew the realism point would come up, but depending on your time and personal tastes it also comes down to playablility. As I had limited free time for gaming, I didn't want to spend all my time doing dive, wait, surfance, dive, wait etc.... whether it's realistic or not. Not sure if I'll hit the same thing in GWX, but before on a lightly modded SH3 I had to add an air mod to lessen some of the air cover as even running deep for hours, after surfacing I'd be picked out again in 30 min. Which means on a decent travel distance you could spend an hour doing just diving. Realistic torps, damage, AI, destroyers etc. all fine for me.. just not the air if it comes to that again.
It's not a criticism of the mod, just playablility according the players tastes/time.
Dont' want to spend all my time shooting down airplanes either.. after all it's a sub game for sinking ships :p
BTW, those green spiral PICs (what we call them in Canada) actually kill mosquitos, just wave one under a bugger that has landed on a wall

. While treeplanting the trick would be to have a tiny piece of one working in your closed tent when you go for your night shower (remove all the sweat and deet) to kill off all the bugs. But being small it would burn out and hopefully air out, so by the time you got back your tent would be bug free and the pic smoke gone (you don't want to be breathing that stuff in).
T.