automatic closing of LP bugs from imported changelogs possible?

[question asked originally to launchpad-bazaar, Paul Hummer suggested moving it here]

I had recently external SVN repository imported and it is synchronized with bzr at LP regularly (https://launchpad.net/yade/trunk). Since we use LP's bugtracker for bugs, I was hoping that https://wiki.ubuntu.com/ClosingBugsFromChangelog would work as it does for packages: saying "LP: #123456" in the changelog would make Launchpad Janitor close bug #123456. But it is not the case (tried with commit http://bazaar.launchpad.net/~vcs-imports/yade/trunk/revision/156).

Is there a way to enable it? I could offer my help with coding that, but I suppose it is simple enough, especially since that functionality already exists for packages.

Many thanks.