let security officers swap their guns at secvends

[Kotlol]

I just honestly see no point in it. Like, when you choose a gun, you choose it for its benefits and drawbacks in different situations. If such situation where the gun is useful happens, go for it, use it. But if a situation where the gun is not so good happens, it is already too late to swap.

Essentially put, take the gun that's best for the job you think it has to do. You have a security team after all.

So if you are COORDINATED.
1 goes shotgun
1 goes wavegun
1 goes SMG
1 goes Tazer
1 is Det.

And if you really need a better team... Have someone go riot launcher with smoke grenades and gas grenades or flash bangs (there are a few)

A well oiled Security team, can defend the whole station from a mob of hostile players. It's why security nerf's were rampantly requested a while ago.
Now you are asking for a buff.