I'm assuming that even with this implemented, we're still gonna have that 4k block limit, is that correct? I've had ideas in the past for my mods which I've avoided as I don't want to go mad and overuse IDs, that's the only reason for asking
You can theoretically add as many blocks as you want while only taking up a single block id, limited only by the size of the metadata value. (I think IC2 does this)