When prompting for the version of the package a bug applies to, please list the available versions and where they come from, similar to apt-cache policy. This would make it much easier to report a bug on an uninstalled package, or on a package downgraded to deal with a bug. - Josh Triplett
The lack of this feature seems to cause some users to submit bugs against an incorrect version. See http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=586161#51 for instance.