[Feature Request] Add an option to save the first frame as a PNG beside the GIF with an optional overlay

[KybernetikGames]

Background

I've implemented stoppable GIFs on my website by saving their first frame as a PNG with a Play icon overlayed on it and using some javascript to swap between them on click.

Current Solution

Currently I've built a very simple C# Console Application to extract the first frame from a GIF, add an overlay, and save it as a PNG.

Proposed Solution

It would simplify my workflow a bit if Screen to Gif just had a check box when saving to also save a PNG and remember which overlay I've specified (if any).

Another (extremely) minor downside of my current approach is that the PNG includes the start of the progress bar. It would be cool if Screen to Gif could save the PNG, then add the progress bar, then save the actual GIF.