Personally used trolls to get resources by having them smash stuff for me before I kill em,they're far more efficient than me at digging/cutting resources anyways.

"Player cruelly harass poor trolls and have them slave away for him until he gets bored and kills them off, what a cruel and ruthless criminal scum!"
Guess it might not be the most ethical. =p

Edit addition: Tests having that much of a mess? Sounds interesting, might go try it.