The keyboards in System76's new models (any with their custom EC firmware) support up to 4 programmable layers idk if they actually work with QMK, but they use

The keyboards in System76's new models (any with their custom EC firmware) support up to 4 programmable layers idk if they actually work with QMK, but they use the same configurator as their custom keyboard for desktops, which can run QMK The Plasma desktop environment lets you modify window behavior on a per-application or per-window basis OOTB, including having them skip the taskbar.