"I do currently have a request_queue, [...] and it is something that is very much in my sights as something I want to change."

I think we should lock Neil Brown and Daniel Philipps in a room for a week, and ask them to work on bio2. Then merge incrementally, migrating one subsystem at a time. They might even solve the md/dm unification while they're at it.

I'll throw in two cases of Club-Mate to keep them awake. :-)