I think Wick Editor should save gap fill mode and frame size preferences. I prefer having the frame size mode on Small so I can see more frames at once.
I also prefer having my gap fill mode to “Add blank frames,” because sometimes I have huge gaps between frames in my layers, and when I add a new frame to the layer it will extend the previous one. Then I don’t notice this until later, where afterwards I have to resize the frame to the correct length which is annoying. I also don’t always remember to change this setting when working on my animation again.
I don’t think this would be too hard to implement. You would just need to add an item in local storage that saves this preferences, and change it when the user changes the preference. Then, when Wick Editor loads, restore the setting to what it says in the local storage.