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The Kobo Touch does use IR Touch, which relies on interruption of light between LED transmitters and recievers. The touch can be used with any surface (i.e. with gloves on, which does not work with Capacitive touch) without the need for pressure, as long as the surface area is the minimum diameter.
Soft objects such as fingers widen as you apply more pressure, which may contribute to the impression that increased force against the screen helps the touch performance. It's not the actual force against the screen that's helping (pushing in of the screen), but the flattening of the surface being used to touch.
So, while it's easy to think pressure helps, Styluses - which have small, hard points - will not register on the device, and applying force might result in broken screens so we do not recommend trying.
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