This Sunday, Oct 20th at 18:00 (UTC), the KDE Goals champions will be answering your questions live. Post your questions here and I'll make sure they'll answer them.
Honestly I wish those developers would focus on the basics rather than esoteric input devices.
KDE isn't stable enough with a regular mouse and keyboard, let alone fancy input devices. It crashes WAY too often and has too many bugs which require the user to constantly have to use the terminal to work around.
KDE: get your priorities straight and focus on basic stability and usability first.
Might be hit or miss. On Kubuntu it wigged out on my often enough that I needed to make a shortcut to restart Plasma, but so far it's been stable on OpenSUSE Tumbleweed.