Probably never :(
Patreon's who donate $15 per month get access to the agrarian skies server
The short answer is no! the long answer the block was always designed to void items/fluids with out a quest attached, in maps Like agrarian skies where resources are finite you really need to watch what your doing
Not really the way we implement features is by map type, first sky block and then adventure maps and next who knows.....
Honestly the list is huge, its only really limited to players imagination, if you know something that might be a good addition let us know and we'll have a think about it (there's not guarantee we will add it), With the help of our patron's were work on feature that are hopefully important to the player,
The hope Is that HQM will help all map types, We really enjoy seeing what mapmakers can come up with, and we really enjoyed thinking about and implementing features to support adventure maps, But there's still allot more ideas and features coming. and a few secrets too.
probably the edit book, its hard to say because we haven't really tracked the time we spend on features /S
The inspiration for HQM came from a live stream @Lorddusk, @Vswe and I were part of, we made up a set of rules which meant that if you died 5 time we banned you. that was the beginning, We had allot of grand ideas but due to commitments we left it, its wasn't until jaded asked it to pick it up again that it became what it is today , /S