Comment 14 for bug 1210575

marmuta, I have tried it but without success. It works perfectly, both for right and middle button emulation) with any type of mouse (touchpad, nipple, Bluetooth mouse, Bluetooth keyboard with touchpad) but not with the touch screen. With the touch screen the behavior is different now: First, I tap the key for right or middle mouse button emulation and after that a place on the screen. Now the emulation key releases immediately, but the click is behaving as a left click (positioning cursor in editor).

I attach the xev output for both right and middle button emulation.