You can either /bind mousechord "+forward" to remove the autorun functionality, or alternatively /bind mousechord nop to remove the ability to run by pressing both mouse buttons.
Yes, you can bind the left and right mouse to Forward, instead of Forward(mouse control). That will make it so your character only runs while the buttons are held down, and will stop when you do.
Thanks you Luscinia so much it worked :-)
I like to use the mouse to move my toon usually pretty much all the time also use it to look. Is there any way to get around the auto run problem that happens when you sometime or most of the time push both buttons down at the same time, because it drives me nuts.