1. They have an experimental Wayland session already. It mostly works except for some pretty important stuff…I also haven’t seen development on it for a long while.
2. I think this is almost a 100% no.
3. I tried to implement that myself. Making them shorter than the screen is easy. Making them appear above the edge of the screen is hard, but not impossible - the code is in JavaScript and the logic is kind of disjoint across multiple files and stuff depends on panels being at the edge of the screen - I didn’t do it in the end because it was too much effort for something I didn’t want that much.

I had lots of problems with the previous version when turning the TV off/on while it’s running, like losing keyboard access (no focus) until you use the mouse at least once and it updating the display settings every time. Hope it’s getting better now.

TBH the keyboard focus issue is happening on most Login Managers and DEs, so it’s not really their fault. I will try it out some time, until then I keep using my SteamOS install.

Depending on your TV it might not be enough. I’ve set it up, but my TV decides my PC doesn’t have CEC because it only starts responding after boot, not immediately.