Just wanted to mention that getting on a dragonflying mount unhides Action Bar 1 if you set it to mouseover with the addon. Would be perfect if there was a way to circumvent that.

Otherwise thanks for your effort! Very lightweight and does what it needs to do.

Hey, this is intentional behavior with the default settings. In addition to hovering over the frame, you can also set triggers to display a module. By default, in addition to hovering, Action Bar 1 is also displayed when you are in combat or skyriding.
You can customize these by clicking tweak and then selecting the triggers you want.

Oh apologies, it's a little hidden away so I didn't realise. Hope this post helps someone else who comes looking.
I'll close it now, thanks for your help and for developing the addon!