One thing that would be nice:
Incorporate weapon qualities into bane weapons, so that they bypass standard defenses of the monster type. It just seems odd to pull a greater chaotic outsider weapon that doesn't bypass most chaotic outsider's defenses, or an ooze bane weapon that is destroyed in 3 swings against an ooze.
These could even be graduated, so that the number of advantages increases as it progresses from lesser bane to greater bane.
Probably a difficult thing to program, but it would dramatically increase the usefulness of the weapons.
Ink