Loobinex: You can change whatever you like in the imp.cfg file. You can raise the strength, armour and health values for instance or you could give them cool spells. If you want them to actually fight, change their fear value as well.

'The cheat menu's work just fine by the way. You've got to use the -alex command line option to enable them. To open them use F12 or Num-Enter either in possession or outside for the different menus. Use F10-F12 on the level select screen to pick levels.