hmm.. you know I'm not sure how to do that. In theory yes, but right now I'd say don't expect it – I'm not good enough to tweak the code that much off the top of my head. I'm sorry.
The other plugin I was using at first had that function (and also ajax!) but would only sort by the order you added the books in.. so I have to chose between that and those other features. I think the sorting is the most important at this time. But thanks for the note about this, I'll keep thinking about it.
I'm also thinking about paying or doing some work in trade for a programmer to help fix up some of the code.