This is not really needed. In fact I would suggest to de-activate the
"request to join" feature. It mails all "masters" (and all DD are masters
since they need to be able to create new repositories) and it doesn't
offer a way to explain why you need to join the team.
Instead one should go through alioth project members and add them directly
to salsa. And -guest users should create their account and ask here to be
added (explaining that they were member before already).
But IMO alioth project members should be added to the "modules" sub-group
and not to the top-level group. Otherwise the "interpreter" subgroup will
have way too many members compared to what is desired.