I don't know if there is a way to modify specific buildings via the static modifiers, but using the proper modifiers can make building faster (which should be applied to the difficulty level used by the player).
IIRC IC will increase 800%. Not 100% sure for recruitment haven't tested, I remember with practical knowledge most units could be finished wihin a week or two so I presume that's at 1000%. Sorry I can't give you a more definitive answer, its been a while, by all means though if thats incorrect just fiddle with the values until you're happy with the result. Cheers
[Edited by overweightninja, 11/13/2009 5:31:46 AM]