[Trac] More than one stats_provider for Roadmap and milestones

Hello!

I'm developing a plugin which implements another progressbar view of a 
milestone. But I want to have the normal ticket count progressbar 
(DefaultGroupStatsProvider) too. Is it possible to enable to providers in 
trac.ini or is it possible to return more than one stat object out of the "def 
get_ticket_group_stats(self, ticket_ids)" function.

I'm grateful for any hints!

Yours' sincerely,

Joachim Langenbach