KDE & Plasma users

Overall I find Plasma 6 a big leap in quality but there are some things that bother me, it could be my ineptitude to find the solution, bugs, definite changes or because of using wayland, so I'd appreciate any clue:

1. I don't find the way to set autologin in system settings
2. I don't know how to put Kate as a system tray icon, it's not on the list of entries
3. If Kate or Okular are already open and I right click a document from Dolphin to open it, they do so but they stay in the background if they were there. The same happens if I open the file from the comand line, like kate doc.txt
4. meta+arrow_key tile the window according to the arrow key used. Doing the same again return the window back to the original position in Plasma 5 (or X11). Very handy. Doesn't happen anymore.

Probably I'm forgetting something else but solving those would be great.