If you need gems to continue: plant apple trees, watch out, large groves can get laggy (and attract deer)
To remove buildings/forests/whatever, use bombs.
Suggestion: make bombs dropped on deer, just blow up the deer? :P
Normal Perk: Don't have to wait for 1st nade to blow before throwing second.
Hard Perk: Press F to blow nade (doesn't work in elite till you've finished it.. hah)
Elite perk: Unlimited Nades in all modes.
The aim being slow ok, but the aim being randomly slow/fast etc makes it more of a pain to play.
Fixed speeds I could handle, this slow/fast is annoying as time goes on