Conductive "App Brick" without human contact This may not be entirely LEGO-related, but more related to touch screen technology.

I'd like the LEGO app brick (http://brickset.com/sets/containing-part-6103777) to register a touch on a touch screen even if I'm not touching the brick. I'd like to put a LEGO construction with such bricks at the bottom on the screen, and register a touch event.

Is that at all possible?
If you are planing on physically touching the brick that will then touch the screen then you could use a trick similar to that used by capacitive gloves

There just needs to be a conductive medium between your finger and the screen so you could add a thin strip of copper tape or anything metallic to bridge the gap between your finger and the touch screen that is created by the insulation of the plastic brick.