Who am I kidding, I'm always the GM anyway!
That's the spirit! Just because you are in a wheelchair doesn't mean you are automatically zombie lunch, its just going to be a bit tougher is all. In the World War Z book, there is a chapter about a guy in a wheelchair patroling a survivors comunity. And another chapter is about a blind japanese monk living in a park and killing (and burying!) zombies. Awesome book that.