Hi there!
1 - My generator can only generates the default 4 directions or the diagonal ones. It cannot generate all of those behaviors you said.
2 - About the 8 directional movement, I can only say for sure that my plugin can handle this by using my 8 directional plugin: https://hakuenstudio.itch.io/hakuen-studio-diagonal-characters-for-rpg-maker
3 - About linking the created characters to the other sprite sheets you have with poses, I can't say for sure. I can say that my plugin gives you an option to set a filename for the created character, on the plugin command. Maybe that can help depending on how the pose spritesheets works with your other plugin:
Now, I don't plan to make a specific add on for this plugin the way you suggested. I know that, someday, I will add a feature to let the characters use another pieces (hair, clotches etc) by using equipments or by using plugin commands. But I don't know for sure when I will start doing this.