lol nevermind, you mention it in one of your first videos of Blue Prince, it's a piece of software called PureRef (www.pureref.com/index.php)

Did you start with something like Doom Emacs, or a custom init?

What I've done for this is create a keyboard layer without any of the tap-hold magic for the left hand, and I can swap to and from that layer with a chord. It definitely helps :)

a shame you seemed an honest man