My app is currently using the Fragments/v4 compatibility package to support Android versions all the way down to 1.6. This means all my Fragments inherit from the compatibility
I asked this question on the android-developers mailing list.
The approach I've taken is the one suggested by CommonsWare, whereby the provided FragmentTransaction parameter is ignored entirely:
http://groups.google.com/group/android-developers/msg/d8d84cdd2f753b71