Amazingly enough...
... I tend to agree with The_Fur on this one:
Some slots, you can-fit-weapons here and here sort of thing, with swtiching times based on equipped location being important. I had the evil thought of a grenade bandolier for those launcher-dudes rapid reload, and that being an occasionally target to turn them into 4th-of-July exhibitions.
Is that realistic? No idea, but it sure sounds fun.
I would allow a second rifle spot, slung over shoulder like. However, I would also like for that to be modeled and carry an extra bulk penalty for the awkwardness of that set-up for some movement modes, most notable prone movement and sprinting. As a general rule, I say give people more than enough rope to hang themselves... as the bulk system improves, I suspect there will be many more folks dangling from the "gallows of bad ideas".
Of course, that's easy enough for me to say, I spend most of my time with a scoped sig, m9, 2 grenades and a knife.
Btw, I've retained and enjoy the PSG1-Sniper loadout that is one of presets. Works well enough for me.