Dragging is fine for smaller tweaks, particularly if it snaps to the grid if enabled, but I don't think I'd want it to be the only way to set the current size. It's nice to be able to just type in the number if you happen to know the size you want, or to be able to, for example, precisely double the size.
Add-to-selection exists, it's bound to V by default, you remapped it to B and didn't use it.
The grid is a mode, and has two effects: Align mouse-dragged tiles to the grid, and make keyboard-moved tiles jump in steps of the grid, whether aligned or not. Looks like the tooltip is terrible: "Round tile coordinates to multiples of 16" doesn't sound like it toggles a mode that affects future moves; it sounds like you must select tiles first, then hit this button once.
Tile copying (duplicating) should indeed be in place... For duplicating-in-place, I'm envisioning some graphical effect of the fresh tile zipping into place from afar.
The resizing menu should ideally be ditched altogether, and be replaced by the possibility of dragging borders within the main view of the editor.
If there's one thing I'm curious about, it would be what the influences and decisions behind a lot of the default keybindings were. I imagine there probably is a reason for them, but they're certainly unusual from an outsider perspective.Because I use my mouse in the left hand, I remapped everything, but my layout basically mirrors the defaults. I find it very satisfying to do everything without moving either of my hands (one on the mouse, one on the home row of the keyboard). Once you get used to it, everything else that requires you to move you hands is frustrating. I use the same setup in other level, image and graph editors (Tiled, GIMP, ipe) and everything's so fast.
Nice idea, but is there any reason that paste-away and paste-in-place couldn't be 2 separate functions? Both can be useful for different things.I don't see any value in having paste-away, really. The only instance where it's handy is if you want to build a staircase that goes diagonally down, and that's too specific to warrant a specific feature.
Maybe each step (2, 8, 16) could have its own hotkey for easy switching?You'd also need one for no grid (=1) I guess. I like one button to cycle around the grid (4 keys would take up a lot of keyboard estate, and I don't want to move my hand), but I guess there's no reason in the settings to not allow setting a separate key for each, and if you set the same for each it replicates the current behavior (like when you overload a hotkey for two skills). I almost always have grid 16 enabled, as the Lix tile sets are designed with the grid in mind.
lack of paste in place
influences and decisions behind a lot of the default keybindings