I have just bought a Gametel controller for my Nexus 5 and it works fine except there are no L2 and R2 buttons. So I thought I would leave the start and select buttons on the touch screen and reassign the physical start and select buttons on the controller to L2 and R2. However when I did this I noticed odd behaviour from the buttons, they only trigger when I release the button! This is problem for games where the button needs to be held down or when it needs to be held in combination with other buttons.
Does anyway know how I can fix this?