The best way to help BATTS is to send me money. If you don't want to send me money for no benefit to yourself, hire me or Barnhard Associates to work on BATTS. Or make some useful changes to the code: The BATTS distribution includes a file named TODO listing high-priority items. Code that solves these problems would be wonderful, as would additional code that meets your needs. The documentation needs help too.
If you don't need to hire consultants, and you aren't a programmer or a writer, you can submit bug reports. If something doesn't work, send mail. If something acts strangely but correctly, that may be worth sending mail, too.
Putting a big heaping pile of code on the Internet for public consumption is a frightening endeavor, and is a big time-sink. Words of kindness and support are always appreciated.