Gotcha. This isn’t currently possible. Are you controlling the mouse cursor with your game pad(with Rama’s plugin maybe; ~ Set Mouse Position - SET the mouse position to any values of your choosing!)? if so, you could do this: Send a line trace from the mouse position towards the Y axis (assuming Y axis is your depth) and trigger a hit if it finds anything.
Sorry that this isn’t really what you were looking for, but it’s the best I can do 
Cheers!