Mac Keys on a PC and snapshot of a keypress sequence

[cricrigit]

First of all, thank you very much for this brilliant little programme I discovered today. It is really well made and very very useful.
I am based on the PC but sometimes do video tutorials where I want keyboard shortcuts to appear for both Mac and PC. Currently, I gather, KeyViz will only display keys from the OS used locally. So I couldn't show a CMD key, if I wanted. Would it be possible to have ability to do just that, either by toggling equivalent keys (CMD for CTRL for example)?
Would it also be possible to have a screenshot mode so that a keystroke sequence can be captured as a static PNG with a transparent background, or/and a PNG sequence/GIF for the animation?