I ever so often close the 🎵- player and when grabbing the 📱 I'd have to unlock it to just start the 🎵 player and then 🔒 the 📱 right away again (as there's #mpris controls on the 🔒-screen then anyway).
Hence I wrote a small #phosh plugin to add arbitrary "launchers" to the 🔒-screen via a desktop file.
This is very simplistic atm (as we e.g. don't track app-state) but gets the job done initially.
I only used it for that purpose but there's other potential use cases: