Perhaps we can create some kind of "virtual" sf.net user, that owns all new tickets, and has the fluid-dev list registered as his "home email" so that all ticket notifications get posted to the dev list? Opinions are welcome.
As someone who is casually subscribed to fluid-dev and occasionally reads the discussions, I wouldn't mind having the bug activity come through into my inbox either. If the volume got too heavy, maybe you could create a new mailing list called fluid-bugs, so that people can separately decide to subscribe to the main mailing list and the bug activity. But at the current activity levels, I think it would be perfectly fine to spam the bug activity into this list. (Also it would fix the problem of people posting to fluid-dev, not trac, for fear of having their bugs go unnoticed -- since they would all go through fluid-dev you could report them to the semantically-correct place.)
Matt