Add possibility to improve wooden items with woodcraft like one with smithing can improve metal items.
What is needed:

1. Wooden item to improve. Either weapon or shield. (AFAIK there are no other improvable wooden items).
2. A tool (axe or hatchet) to work with the wood. Hatchets should give better rolls.
3. Wood. Either logs or wooden sticks. Logs should give better rolls.

Blessed items should give better rolls as it is currently works for smithing.

For shields DV and PV should be improved. For weapons to hit and to damage (assuming weapon is completely wooden). I'd cap improval to +4 from basic values if woodcraft is at 100 and logs/hatchets are used for crafting. So wooden shield which is [+3, +1] by default could be improved to [+7, +5] if you've started with woodcraft, wasted some points on it, was lucky to find a hatchet and got good rolls.

Inspired by comment from Blasphemous for the issue 3853.

There are other suggestions which are necessary to make woodcraft usable and do have community support: 2685 and 1763 or even 3840 partially (axes to chop trees).