As i said, i'll need to see 0.17 before i can say what will become of Quickprint (but to be transparent, the chances of continued development are slim at best).
Undo/Redo is already planned for the official implementation.
I originally created Quickprint to make building small repeating patterns (furnace rows, etc) easier. The thread you linked is a completely differnt use-case of moving already built entities which would need a different tool imho, because when i say "cut" then i don't want a bunch of untouchable buildings, i want them gone. (Also i don't want the user to end up with garbage buildings when they uninstall the mod.)
Also a major hurdle for a 0.17 implmenetation is that i'd have to cope with the build-in hotkeys by either hijacking them or making up yet another set of hotkeys. Neither of which sounds particularly fun to do. Because the whole Quickprint "item" thing was always just a workaround for not using hotkeys and there are better API solutions available in 0.17.