The Lenovo N5902A is fully supported by Linux (at least since Ubuntu 10.10).
It can happen that the contact with the touch filed of the keyboard is interpreted by the N5902A as a scrolling gesture, if one tries to grab the wireless keyboard. To suppress such behaviour the following command can be used
xinput set-button-map 8 1 2 3 0 0
to deactivate the middle mouse button.