On Mouse and Mouse Coords nodes should also work on mobile. For special touch handling there is On Surace node, which in the future will allow to query multiple fingers for multi-touch controls.
For example - this node setup will fire an action when mouse is clicked, display is touched or gamepad button is pressed.
You can then use Coords nodes to retrieve input position.
If you are trying to implement a clickable UI button, then it should also get quite easy soon. I am working on a tool for Armory where you can define UI elements, and interacting with these elements will then fire events which can be handled easily with a single node.