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.