Hello gerardo,
I wonder if you can make the process simpler by just asking for key responses instead of a mouse click to capture the data about choice A or B.

If knowing the quadrant or area on the screen important to your study on choice, and you're using the mouse cursor functionality to do that, I wonder if you can use a program like this to help you: http://superuser.com/questions/384099/is-there-a-win7-shortcut-to-position-mouse-in-center-of-primary-screen

What this does is it helps you create a shortcut (Ctrl+Alt+Shift+C) to return the mouse cursor to "home" (in this case, the center of the screen). you would have to have the participant do this step, though, and it would be tricky to do within DRT. You could bounce between DRT and ML, though. For example, run the experiment through ML and show a trial in DRT, have it end, and have the next trial in ML be moving the cursor back home.

Just a thought, and I can't guarantee that it would work, but if having the cursor return home is important, it might be worth a try.