I was using the mouse copy-paste extensively, until recently, when some OpenSuSe upgrade reconfigured this on all my machines. Now the scrollbuton is the one to paste (which I hate, since it's hard to click without scrolling, and I also click it sometimes accidentally).
Where is this configured? Ideally I would love something that I can add to session start (for both Gnome and KDE).
Best Answer
It is configured in /etc/X11/xorg.conf.
You'll see a section that looks like
Here is a random vaguely relevant link from SU.
https://superuser.com/questions/258649/multi-button-mouse-on-x11-how-can-i-configure-several-buttons-to-act-as-the-midd