Yes, danger rooms should be dangerous, but as it is now, the rewards don't really justify you having to go in there with the wrong equipment so it'd be great to add arsenal stations there. I'm tired of opening those energy gates just to find out that p.E. there's a "bullet hell room" behind it when I didn't bring a gun.
( Also, arsenal stations in other places would be neat at times. Like the beginning of boss-strata lvls, too: Don't see why not. No reason to punish players that (a) bring 3* armor to solo fsc to lvl it or (b) forget to change their equipment. They can leave/rejoin if they're in a team anyway. )
They would have to be inside the danger room. If it was in front, people could use it for the rest of the level without playing the room. You'd also need a 1-way gate to keep people from coming back and abusing it.
Still, I'd rather just have more rewards than better equipment for danger rooms.