And for you users, keep in mind that if you use a file at least larger than 64KiB, you have to search for freespace manually. We use slogger for that. And due to the limitations, it also reserves four banks instead of just however large the GFX file is. Again, limitations.
Yes, poses $C0–$FF are free to use for whatever you want (that’s 64 poses, and with an upcoming patch of mine, you’ll be able to use even more), and you also get a total of 136 free frames in PlayerGFX.bin (the old version only has 9).