Now, this suggestion is a rather difficult one, however could be a great idea.

Players could have the chance to apply/purchase a custom modelled weapon. As you might know, Ed has his Hoover... Dutch has his lightsaber.

If players had the chance to apply/purchase a custom modelled weapon, DMU would be even better/more fun!

One word: HireSWD

Like Laurynas said just use HireSWD, that's how staff members get their custom weapons.

However, your weapon wouldn't be as powerful as a staff members custom weapon as that isn't allowed. And you need to have a model/someone who can make a model for the weapon.

If you did want an OP weapon than it would only be accessible on singleplayer, not the servers.