Seeking a forum [on hold]

I would like a board that can support a few hard to get features:

1. Dynamic screen names and other local flairs that a person can use specific to a post certainly represent the highest priority

2. I would like a way to let a top forum include the subforums' content and/or a system allowing tag forums the way http://ift.tt/16o2InR can

3. Hierarchical reply structures similar to reddit and slashdot would be a help but I would prefer a forum specific option to use these or the flat way forums commonly employ

There is not a board out there with all of these I think?