Hi Silvan, thanks for your quick and detailed reply.
To be honest I’m not a big fan the KDE desktop, I prefer LXDE, XFCE and some bare windows managers. I can help with reporting bugs and I have some suggestion about the artwork and interface of the LXDE desktop. Also a new cursor theme should differently be added to the Pi image. Is it easy to create my own spin when I’ve my changes to the desktop? I tried to install the X64 LXDE desktop into VirtualBox and QEMU but the installation newer finishes (maybe I should a new topic for this one). I still haven’t tried on bare metal, but this will happen soon.