I've been using WinSCP for a bit now however, the only thing missing for me is a dark theme for us nighttime keyboard bangers.
Most dev/support apps now support some form of dark theme for those of us that find the blaring white hard on the eyes at 3am (Even Chrome's inspector has a nighttime option).
I'm not requesting a total theme extension, just a secondary primary option that sets the entire interface to a dark theme (unfortunately the current view > color option is just too simple).
I'd be happy to volunteer to convert any gui graphics to a dark theme version if that would help.
Just for reference, I'm referring to something like (google images: "chrome dark theme"):