EDIT : If someone has the same problem and land here, I resolved it by myself by simply deleting the outfits walk animation causing issue ( no double click ) , reloading the exact same frames, and now it work. With the settings shown below in the mouse properties and nothing more.
In my monkey see monkey do homework at the moment, I try to change the speed of the character by double click.
I've changed the double click in mouse properties, copy/paste the same than the demo settings ( except the cursor look loading changing ) to change the speed but it doesn't work.
by default I tried to set a double click action direct in the interface ( walk cursor ) with the same actions,
-change speed up
-Wait character stop
-Change speed to normal
And it doesn't work either.
So where do you think I 'm missing something please?