There is absolutely 0 value in tackling that until someone can fix hash's performance problems. If there is no real-world scenario for using it ... which there really isn't ... then adding WAL support still leaves you with no real-world scenario for using it.
This is not to suggest that I wouldn't like to see all of that fixed; I would. But let's concentrate on the showstoppers first, rather than expending effort that might ultimately be a waste.
I agree on that. I think working on Hash clusters would add more use-cases than working on hash-indexes.
