I don't have anything else, as a remedy... odd that the click wheel is generally unresponsive, EXCEPT for those two buttons when you do a reset.
The fact that your iPod's hard drive (plus everything except click wheel) is fully functional gives your iPod some value. You can sell it on eBay as broken, with a working hard drive. Most iPods (with a hard drive) that are broken, are broken because of a bad hard drive; someone will want it, just for the working hard drive. OR, you can look for an iPod (of the same type) with a broken hard drive, and swap in your iPod's hard drive. OR, find one with a working click wheel, to replace your iPod's broken click wheel. OR, you can buy a mini- hard drive case (sold on eBay) for the iPod's 1.8-inch "ZIF" hard drive, and use it as a tiny external USB drive.
This web site has instructions for taking iPods apart
http://www.ifixit.com/Device/iPod_Original
and there are probably also YouTube demo videos.