I would like to hear voice of developers too...
It was said many times that there is enough weapons in FOnline, they just need to be balanced,
useful for various situations and obtainable in ways according to their power.
There would have to be a good gameplay reason to introduce a new one, for example I think we
sort of lack a big gun or energy pistol that would be the cheapest crap for total newbies and very
easy to obtain - equivalent of mausers or shotguns for small guns. Then we could perhaps make
flamers and laser pistols slightly better and/or more expensive. But we certainly do not lack small
gun rifles, pistols and SMGs in the game in general, we already have plenty of those and many
aren't used for anything.
Out of those that you proposed I think only the grenade launcher could bring something really new,
explosive weapon for small guns.
The rest either have equivalents (like P90/10mm SMG) or is very similar to what exists already but
isn't used, because it's too hard or impossible to obtain (like Bozar).