Well the rotation I thought about it for having mag pouches facing the front to make extracting the mags easier.
I tried an adapter and even though the molle fixation made it a bit wobbly it was really a lot easier to take the 30rds AR15 mag out.
For the molle on the shoulder strap that's for having extra webbing for a surefire lamp, knife scabbard, ECM or communication equipment, etc.
For the shoulder armor I speak of this kind of things :
Not many use these (I don't either) but I like having the most options possible
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Tous les jours nous nous endormons plus instruits mais pas forcément moins bêtes...
I can do a CTRL+ATL+DEL on your gun !
Gun doc in Montreal on AEG, GBB, GBBR and Bolt rifle (gaz and spring)
Heavy custom builder (including painting)