Quote: "One trivial but "nice to have" feature for the IDE would be the ability to easily open up the project's directory within Windows Explorer or Finder."
I agree, I'll add it to the next version.
Quote: "Relatedly, the option to show all files in the project directory within Geany could prove beneficial for editing non .agc files such as other configs, xml etc."
Not so easy, I'll have to think about this one.
Quote: "With regard to the spine commands, a command to flip your character in the horizontal plane would be more than useful."
This will be in the next version.
Quote: "AGK 2 EDI on Mac start on this screen, even I'm using the principal one."
I don't know how to target screens on the Mac, and I don't have the ability to test it, so this will be difficult to change.