@I9S
Mirroring when the canvas is mirrored would need the addition of a signal for when the canvas is mirrored to the PyKrita API, but that should be doable. I’ll update this when I have an MR to add that to Krita.
The ability to toggle dockers with a shortcut is something that would be better as a general Krita feature. There’s an open MR related to that, it’s for toolbar buttons to toggle dockers but it would also make actions assignable as shortcuts: Buttons to toggle docker states, with (reused) icons (!2419) · Merge requests · Graphics / Krita · GitLab
Or you might be able to use another plugin like Docker Under Cursor to do something like that.
Also, you don’t need to go in the menu to turn the docker off, you can hit the close button on the docker titlebar.