Just started using this editor today. Mostly it's a huge improvement over the old editor, but there are a few quality-of-life features lacking:
* If I maximise the window, it would be nice if the editor remembered this next time I open it.
* "Open" dialogue could go straight into the "levels" folder.
* The scrollbar under the level should have a button that resizes according to how much of the level is currently on-screen.
* "All to Front", "One to Front" labels are misleading. These features are usually called "To Front" and "Forward", and similarly for the "back" buttons.
* It would be awesome if I could drag the level window / terrain selection window boundary upwards, so as to get more terrain pieces in view at once.
* As with "delete", it would be nice to have a "duplicate" hotkey that copies and pastes a piece with a single keypress. Also, ctrl-C should just copy a piece without duplicating, as users will end up with lots of duplicated pieces in their levels through thinking they have to ctrl-C and then ctrl-V.
* When the grid is active, the arrow keys should move a piece by 8, rather than snapping to a multiple of 8. This allows quick tiling of pieces starting from a position that isn't aligned to the grid (which is sometimes necessary if you want to place tiled pieces next to irregular pieces).