Well, I did apply the redirection rules, for the moment. It works fine.
But I am considering just going and delete everything from the activity stream, since nobody is active on the site, for the moment. So I might as well go and restart the whole activity (basically just me).
Duplicate stuff is not good for SEO and redirection slows things down in some occations.
Tomorrow I’ll write a ticket in the TRAC as you suggested.