I've seen lot of people who accidently drop their precious weapons, like arcane bows.. so I really think making rare+weapons unable to drop is really needed. although its my personal opinion, It really seems like lot of people drops their weapons accidently... so uh, only tradeable by /trade would be nice.
I like this idea xD I've seen a number of people accidently drop weapons when they press Q, expecting it to reload (As it's Q to reload in Warzone and Infected) and I've even done it myself once when I tried reloading my seismic hammer (I managed to pick it back up tho).
I have come so close to doing this with my thunder trident too many times to count, so yeah I agree with this