Stuck In Neutral
Terry Trueman (2000)
A narrator with severe Cerebral Palsy describes what he sees, thinks, and longs for, and how he fears his father may end his life out of "mercy" -- not light themes, but lots of humor and personality. Similar to Out of My Mind but Shawn is much less functional, more "trapped" by his disability. The book, and narrator's fate, has one of those he did/did not endings, but there is a recent sequel out so that settles the cliff hanger.
Great review and discussion ideas here at TLT: Teen Librarian Toolbox and an interview with the author, whose son has CP, here at The Hub website.