With the Helpdesk package you could define different types of Bugs for each of your products and assign different lists of versions for each bug type using DynFields and Categories. However, the Helpdesk package is still beta, so please try on a demo server first.
The Bug-Tracker is a package originally developed for OpenACS, and not for ]po[. So it does not adhere to the ]po[ configuration mechanisms, but to the OpenACS configuration.