Voted for this bug. This is not only a convenience issue : a lot of OpenSource projects still rely on SourceForge for historical reasons, but are only waiting for a good opportunity to switch to a more powerful bug tracker. (and I'm not going to detail here the reasons why SourceForge tracker can not even be considered decent anymore)
Trac has a feature to import Sourceforge tickets, and I believe that this is the only bug tracker that allows this.
I do need this feature, true, but I seriously think that having such a tool would greatly improve JIRA's popularity.