I was looking at some old cds of my and i found this old Rank mod, Where took out "Consume" from the Infested Duran to level up a marine and make him stronger.
Max Weapon Range=8
Max Weapon Range=10
I think was for 1.07 / 1.08 Beta stages, i know worked in single player.
I've added the mod for you to look at has the .exe file and rank.mpq file, meh!
I thought about updating it to current ver but meh..