Disclaimer: This is not a "current" suggestion in that I'd be interested in it being implemented as soon as possible, or even soon. I'm just putting it down on paper so I don't forget. There's a feature freeze for now, so this will sit here for a bit. Thanks for reading anyway!
The combo pages currently have an ability to insert or delete combos where the flashing cursor-box is if you press "i" - I'm curious if it's possible to do something similar in the Tiles Pages. Obviously this will heavily impact where combos, FFCs, and even scripts (Which aren't changeable like the rest are.) are referencing. ... Though I think FFCs refer to combos so nevermind.
For example, if I want to add an area to the "Grass" part of the Tiles Page where it's all transparent, I still want grass to be with grass, but I have no more space near it to add it. Instead of shifting eeeeeverything down page by page towards an empty space, it would just remove things off of the last tile page (Which we should plan for.) and shift everything down by 1, 20, 40 tiles, or a full tiles page. The panel would have "add" or "subtract" so you can push tiles away from the current cursor position or vacuum tiles towards it by that amount.
I don't remember anyone dismissing this as being possible, so may as well write it down somewhere and let it sit for a while. It can always be bumped.
