Well I had this idea when reading a topic about the shock rifle on the general board. I think a cool mod would be to replace the entire weapons set with the weapons from unreal 1. [With new graphics of coarse wouldn't look right as a direct port]
The Damage amp could be the Energy amp from Unreal it would only effect the ASMD[Shock rifle] and Dispersion pistol.
Berserk could be replaced by the Dispersion pistol power up or keep the berserk and replace the redeemer [or both] with the weapon power up.
Im hoping for OSMT, so that we have a gametype like Unreal 1's campaign.
I kind of doubt it will happen now though, but who knows.
Epics hype machine made it seem like the tools for a good coop mode would be there.