Don't know if anyone else did this before, but I patched in a 9th spell slot and tidied up the code a bit. Tested briefly in game; it doesn't give any errors and loads just fine for me, but I don't have any characters with the 9th slot enabled.
If someone with 9th slot AA (and preferably all expansions) could try it out (both big and small versions) and make sure it works I'd really appreciate it!
This was always my favourite cast bar... will be nice to see it working again (I hope)