Argh, I don't know how I missed the "H:" in front instead of "L:". Expectation bias?!
Anyways, in Spad, you simply create "Client Events" For HTML events that aren't already present. The SPad team will often add HTML events upon request for planes, but this is very easy to do. Screen shot below for anyone else wanting to do this, ignore the first entry. Nothing to configure, just paste the event names from the manual as shown. These work fine, though the buttons don't move (maybe I'll dig in the developer tools someday to see if that's possible).
Thanks as always, Nick!
[image: f98ac399-a133-4abc-ad26-19e57c019d48.png]