HAT is an tool that is offered to the developer community in the hope that it will be generally useful. There is a java.net project associated with it at http://hat.dev.java.net/. There are various resources there, like mailing lists for discussion and suggestions. I'll try my best to keep on top of things, but no promises! If you want to contact me directly, my e-mail address is given in human-readable form at the top of the README.