First of all I wanted to thank you for making this amazing photo viewer. By far the best and most customizable out there, I love it to bits.
That being said, and I know you said you cannot spend time developing it anymore, I’d like to leave a few requests/gripes I’ve had with the tool so far:
1. You recently added transparent background support with black/white/grid presets. Could you add an option to disable it entirely, leaving whatever background color we have set instead? It's a lot more useful than picking from just black/white.
2. Panning a zoomed in photo around doesn’t maintain a 1:1 movement. Basically you move less while the image gets dragged a lot. It's a bit jarring and imprecise. It would be nice to have it follow the cursor without any multiplier.
3. The bottom control bar looks a bit out of place, not to mention like something from 2003. A simpler, more modern/minimalist look would be greatly appreciated.
4. You offer the option to hide the zoom-info control but you cannot disable the top-right number preview from showing up.
5. And extending the point above, it would be nice at least if the zoom overlay could be clicked to reset the zoom level to default.