Yes, I have an Ixus80/SD1100 too, and I used to have an Ixus55 with CHDK so I know what I'm missing.
I'd like to work on this, but "real-work" is getting most of my time these days. If you can help, search the board for Ixus80/SD1100 firmware dumping threads.
The problem right now, I think, is that the universal dumper is not working on our cameras, so either the universal dumper needs to be modified, or another approach is needed.