I have a serious lack of hp comms on my DW reading list as well. One of the reasons I have not deleted my LJ is that I made a filter there to check out the comms.
I don't know much about modding, but gracerene said in a post that a lot of the functions that might be needed for scheduling posts in a fest comm are missing on DW, so that might be a reason.

Also giving my vote for nextgen_mas to come back. ♥