Right now once an all pickups lock is triggered, it changes to the first tile in the tile set. It would be super handy if we could indicate what tile we want it replaced with.
Yes, this will be possible. Right now, as it stands, these are locked to the tileset, and you can make the definition tileset by tileset (but we haven't shown that feature yet, or implemented it in the updated engine...because it may change). There are also 4 types of "change tiles" per tileset.