Feature Request: Preference for Double-Click Behavior

Currently, the double-click behavior is to have Ristretto go Fullscreen. This seems to be very different from most other image viewers which seem to instead use double-click as a shortcut for toggling 1:1 zoom.

I understand for long-time Ristretto users, this is muscle memory, but for long-time not Ristretto users, my muscle memory gets confused by this :P