This isn't really a JJ2+ suggestion, so it's not going to be a high priority. But I will say that the file format of sprites in j2a files is publicly available, and the other day I ran into somebody looking to help us out by writing an independent program if they were given the right specs, so maybe the two of you could work something out?

Your sound/physics suggestions from the previous post are all reasonable. The problem is they fall in that special intersection of neither fun to fix nor a major problem to leave unfixed, so they just hang around at the backs of our minds. If we (or anyone else) ever does the work to make a public issue tracker for us, it'd be nice to post that kind of issue there so we could get a sense of how many people are interested in this or that problem getting resolved.