I dont think so... the IJN have DP gunners and Machine Gunners, its another sailor
branche, like medics, seasman, accountants, etc... maybe they can add some strategic
effects to someones playstyle, maybe they're shit...
the point is that there's something more than just gunners/AA/Reps or
gunners/reps/reps sheduled since pre-historic ages of navyfield, like the SN... and now
that SN profecy become real, we can think about Navyfield ending the "beta" version
and starting the (cof) "stable" version with full content...
the classical BB isn't the only style of playing and isn't the only class... since the
introduction of SS the FF<->CL classes have become more valuable in-game, and new
interations and strategies have emerged...

i think, i'm talking shit, almost everyone in GB that are FF<->CL just run like a freak and
get sunk or stay all the game shooting planes... and the subs just go ahead and get
sunk... but... well i wanna see that machine gunners ^^

You know why they created machine gunner for SN and MN?

SDE fast and failure delivery.
Too lazy to work on A guns and creating dedicated AA gunners.

I'm going for Soviet AA. But then again, I try not to do what everyone else is doing. It's just
not fun if my crew is an exact clone of someone else's.

I am going to use normal gunners. At least I can use HH's if the subs are flooding rooms. But
yeah, I would like to have another nation with REAL aa gunners and their own guns.

The Machine gunner sailor is useless and also the SN BB5's T slots are terrible for AAing.
3 on each side and 2 in the back behind the main gun.

The effect of high lvl BVEd machine gunners in support slots?

Exactly zero.