I run Linuxmint17 KDE
I have used system settings--input devices--mouse--Advanced to change the double click interval to 600msec
This is correcrly represented in the file ~.kde/share/config/kdeglobals
As I am lefthanded I changed the left and right mousebuttons
I have also set SingleClick=True
In many applications I still have to doubleclick. Double clicking only works with a fast 200msec click. Not 600msec (I even tried a setting of 1000msec as a test)
Where could the kdeglobals settings become overridden?
Any suggestions highly appreciated

"in many applications" are these KDE apps or others' apps?

this thread may help (or not) viewtopic.php?f=225&t=122085&hilit=200ms

KDE applications use the setting SingleClick=TRUE in ~.kde/share/config/kdeglobals so ther is no double click interval.
All other application such as Firefox, LibreOffice and more still require a double click at 200 msec. This suggests that non_KDE applications in LinuxMint do not use the settings in ~.kde/share/config/kdeglobals
Your reply set me in the right direction as it led me to a post in the Kubuntu forums https://www.kubuntuforums.net/showthrea ... rval/page2
I edited ~.gtkrc-2.0 and added a line gtk-double-click-time=600
This works OK!
SOLVED
thanks a lot