[x] Block ID on hover: show the id of the block or object or whatever when your mouse is hovering over that specific one. Could be useful for mods, too.
[x] Layer toggling: for being able to hide the front layer, and only view the background blocks. or only view objects.
[ ] JSON Export: For the sake of viewing worlds in Tiled, or converting worlds to dungeons. Could be PNG export, but well, that is less useful for dungeon worlds, although colorful.
[x] Allow aspect ratio to change: yeah, this kinda gets to me, since if I want to make the view bigger sideways, it also would make it change size vertically.
[x] Zooming options: the ability to zoom into the blocks, for looking at details.
[ ] Search for specific tiles: only really useful for server managers working with mods, would allow for us to locate what worlds have problematic blocks, and where.