I need help! How to configure the mouse in SnemulDS?

I wonder how I can configure the mouse in SnemulDS. I know that you change it in SnemulDS configfile, but I can't get it to work! I've Mario Paint and want to test how the mouse works in SnemulDS, but I can't configure it so it works. If I drag my stylus up in the touch screen, then the "mouse" just moves to the left. And if I drag it down, then the "mouse" moves to the right. If I drag the stylus to the left or right, then nothing happens! How can I configure the mouse so it works as it's supposed to work? So the X- And Y-Position is the same as my stylus. Please HELP! (Hope you understand the problem)...