Hi again, and you're most welcome!
Thanks very much for your accept, most generous bonus and reply.
Oh, what a lucky boy he is, to have been given a loving home by you! Poor baby, found with a broken jaw! Perhaps he's not as friendly as you'd expect due to his hard start in life, and being feral.
You may be on to something re: the scratching and your long hours at work, and away from home. Try this: leave a tv or radio on low volume so he feels like he has 'company'; leave nightlights on in the rooms where his food/water and litter are located and in the room he sleeps in--it's a fallacy that cats can see in complete darkness, although they see better in low light than humans.
Try covering the area he favors to scratch on, with a rubber or plastic mat, like a 'runner'. I'm glad you're keeping his claws well-trimmed! Add another scratching post and some scratching 'pads' which sit on the floor. The come in flat, narrow, wide, and inclined and are not too expensive. If he likes scratching on a low surface like the carpet, he might enjoy the pads. Spray the pads and his scratching post with Feliway, a cat appeasing pheromone which helps cats feel more 'familiar' with an item or a room. Don't offer him the pad until the Feliway spray is completely dry. You might also use the plug in diffuser, but don't place it in an outlet that is easily accessible to him. Here is more information on Feliway: www.catfaeries.com/feliway.html
I'm glad you'll be bringing him to the vet this weekend, and then you'll know more about what's going on with his chin.
Cher (please do not click 'accept' again)