nope, nothing. I noticed there can be an owner of the wood block, so i set my NPC as the owner, but in vain. I have problem with "lean wall markers" as well. The NPC just turns around the marker but never leans against the wall,...
I think owner is used for theft detection so that probably won't help an NPC use it. I'm very new to the CK so I'm not sure what help I can be. But I'd like to know how this is done myself.

Browsing around the AI package I did notice that the Chop (WhiterunSigurdChopWood8x8) and Carry packages had locations specified in their parameter list. Was your NPC also in the same area or did you modify it to work in a new cell? There's a handy button there in the Selected Package Data that says View. When you click it, does it move to the area you expected?
I suppose the next step if putting in Debug info for when he's pausing. You need to know what scrip is actually running there, if any.
Be sure to come back and tell me what you do to get this working, lol!