Thanks for the kind words!
Can you add a section to a rule to horizontally or vertically flip a result? Some tilesets just include one corner image, for example, so making the other corners requires some flipping. See this Kenney tileset: https://kenney.nl/assets/bit-pack
I'll give this one some thought about how it might be implemented nicely. With other tilemap software I have had situations where I've accidentally enabled this on a tile, and ended up in a confusing position where I have an out-of-bounds index in my resultant game. Additionally I try to approach any changes to the tiling portion carefully as I want to avoid making anything more confusing than it needs to be -- elaborate rulesets can already make things a bit difficult to keep track of sometimes!
My tiles have padding in between them but less padding on the outside of the entire atlas; do you have plans to support that weirdo configuration? ;)
I've always wondered why people end up with this setup and was convinced it was just a feature-which-no-one-uses in other editors -- would you mind sharing your reasons for it? It shouldn't be a difficult change to support this, though I'll hold off for now at least as there's another feature I want to implement that would require rewriting support for this if I added it now.
I tend to write games that build using `Makefile`s. Any plans to offer a CLI-based export?
If you mean something like the following, I'd be happy to add it into version 1.02:
tilekit -export input_file.tkp output_file.json