I have a quick play and it seems to work fairly intuitively.
Personally I'm not keen on the presets that have been provided, I would prefer presets such as Mac, Jquery, Windows, Yahoo UI style buttons.
When I tries to rename the preset I found that if I highlighted the name and tried to type I couldn't, but if I clicked at the end of the name and pressed delete I could then change the name. It would be slightly more intuitive to highlight then type (I think the other extensions that have presets work that way...).
I like the option to change your cursor types but there isn't a hand option, and I'm fairly sure you don't need all of the resize options. I'm not sure I would use the resize cursors, but if I would I would probably like to have more descriptive names rather than all the same.
Maybe this is a bit picky for feedback, but that's what you get for not having any bugs that I tripped over :0)