Changing the category admin area

Hello all, Thanks for the help.

I would like to change the way categories can be selected on the post admin page page. Instead of choosing categories by check boxes, I would like to have a combination of check boxes and drop downs. Also I would like to spread it out…make the category area longer. Are there any plugins out there that allow for a more robust category selection area on the admin page? I haven’t been able to find anything. Thanks again.