On most window managers, you can bind mouse extra button for moving and resizing windows. Unfortunately not in kwin, and most those window managers are stuck with x11, not wayland.

To be clear, as an example, this is how it's configured in openbox:
      <mousebind button="button8" action="Drag">
        <action name="Resize"/>
      </mousebind>
      <mousebind button="button9" action="Drag">
        <action name="Move"/>
      </mousebind>

What it does is that i can drag and drop a window by using button9, and resize by holding button8. Without using meta/control on keyboard or the usual left/middle/right buttons on the mouse. Buttons 8&9 are just additionnal buttons on the side of the mouse (i use the thumb).

This is extremely convenient. I didn't care not using kwin until now, but with the move to wayland, this is something i deadly need. Please !