Jay,
Hats off for the glass half full attitude. You've already won the most important battle.
I'm a Physical Therapist and I was wondering if you are seeing an Occupational Therapist? While us PT's are smart and good looking
....well at least the females are... OT's are really the experts in hands. Specifically an OT that is a certified hand therapist. If she is really hot then forget this and just keep doing what your doing!
The nerve damage issue is a 50-50 proposition. It can take up to 1 year for that to return. It most likely won't be completely normal but the hypersensativity should lessen. The hypersensativity is just a sign that things arn't right and the nerve is still healing.
They have some desentization exercises that can help. Some people say fluidotherapy (a wierd machine that bombards your hand with ground up corn husk that are heated) can help with sensativity. The stiffness just has to be stretched out and is limited by the location of the incision. If it was through the joint then it will be limited for sure.
As far as the shooting goes... I bet having your thumb up against a riser is going to send some vibrations down that bone that will be uncomfortable for a while. You may need some type of padding around the thumb to help dampen that vibration. Be patient and only take a few shots every night until the bone and soft tissue can toughen up and tolerate to the shock of the bow when it is released.
I think Kirk is right about the light weight bow at first. Try to get a 30-40 pounder to work with. Build up your tolerance to the shock that the bow will put against your hand.
I'm almost wondering if a straight handled longbow might be better for a while so you can use more of the palm of your hand insted of needing the web of your thumb like you do with most recurves. You will just have to try and see which one hurts less.
Good luck with the rehab and keep working hard right now because everyday that scar tissue gets tougher to break up.
Good luck,
Chris