I dont know if this could ever be implemented in the game... but there is one thing that I realy enjoyed in a somewhat similar game, some of you might have played it a while ago, I'm talking about Thief III... There was a certain oil that you could use on almost any floor, that made bipeds slip and fall

that would be nice.. also as I recall the oil was flammable so you could set up some awesome traps

(Trip and burn anyone?)
This would however requires some ingenuity and an extension to avaialble animations... maybe I should post this on a Bethesda forum