One of the biggest complaints regarding DOOM 3 is the fact that the player is'nt given the possibility to use the flashlight and a weapon at the same time.
Now, a certain Glen Murphy has made a 31 kilobyte mimimod named duct tape. This mod's only function is to allow the player to attach the flaslight onto the gun, finally letting people see the frigging imp they are shooting at.

Dowloadable from the site:
http://ducttape.glenmurphy.com/

That was all.