I know we have a GAF Dota steam group, maybe we should have a highly moderated GAF IHL Dota Group with only active players in to help with the friends lists?
Despite your custom title, this is a really good idea, though not for the sake of the friends list.
Since being in the Steam Summer Group and seeing announcements being posted after every community choice winner is announced, I thought that this would be a much cleaner system to announce IH matches. I'm always available for IH matches apparently, but I don't check the GAF thread or open up Dota 2 to get in the NeoGaf channel until 4 hours later when teams were stomped, salt was distributed, and free items were shot through t-shirt cannons. Someone creating an announcement calling for an IHL match is a much better system than IRC or posting in gaf, in my opinion. Make everyone an admin in the group (or just frequent captains) and if they need warm bodies to fill up their roster or just want to drum up some interest in an IH match they can make an announcement in the steam group.