Well, it's not only a matter of rewriterules (far from that actually).
My plan here is to support URL rewriting for such modules, but this require an update of the phpBB SEO mod rewrites, because for now, this would make the regular phpBB rewriting process a bit heavy.
The update is a complete rewriting of the phpBB SEO mod rewrites, and is intended to be usable for many mods and modules without the same performance issue.
Actually, I worked on it yesterday, and I am pretty close to release
Anyway, this mean, I am willing to support the URL rewriting of many mods and modules, but this will be after the update.
Be patient, things will start moving a lot faster soon as far as mod release here.