Player - Set (Owner of (Killing unit)) Current lumber to (((Owner of (Killing unit)) Current lumber) + 10)
Player 12 and Neutral Hostile are examples, add any players you want to the events.
When doing the lumber + 10, choose arithmetic from the list, and find player properties.
No problem, there is also an option to add lumber without arithmetic (Player - Add property); Player - Add 10 to (Owner of (Killing unit)) Current lumber. Which is more straightforward, i just didn't remember it was there at the moment of answering.
There's a few Object Editor fields you can edit as well:
Stats - Lumber Bounty Awarded - Base
Stats - Lumber Bounty Awarded - Number of Dice
Stats - Lumber Bounty Awarded - Sides per Die
Though these will only work if the Gives Bounty flag is on for the owner of the units. You can use Player - Turn Player Flag On/Off to do that.
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.