Tips on getting a second cat? First cat is "special needs"...?

My kitten is about almost 11 months old. He's all by himself while I'm at work and I was thinking he may want a companion. The problem is he is a "CH" cat (cerebellar hypoplasia)...so, he is able to use a litter box and what not, but he falls down a lot and cannot jump the way a "normal" cat does. He is also deaf...or really good at ignoring ALL noises. Being a CH cat, he uses his claws a LOT! He uses them to climb up on the couch, since he can't jump, and digs them into the carpet to help maintain his blanace. His dependency on his claws and his love of attacking me (grabbing my arm with his claws and biting and scratching at the same time) has left me with unsightly scratches (my vet taught me how to "discipline him, doesn't work- also I guess I could just not pet him, but he's too cute). Is he just playing, or is he really aggressive? Does he sound too mean for another cat? What are tips on introducing cats to eachother? Would a "normal" cat harm a disabled cat? Thanks!