This has been driving me crazy. I have been trying all kinds of combinations but ultimately failed to get it to work for both touch and mouse. I have been cursing Construct but now I realise the fault must be on the Android browser. (I have to add that I am VERY impressed with Construct as a whole.)
If I use "(touch) on touched object" without "use mouse input", my game works fine on both Android and IPad (but not on laptop/desktop of course).
If I use "(touch) on touched object" with "use mouse input", it works on IPad but generates a double touch on Android (and works fine on laptop/desktop).
If I use "(mouse) on left button clicked on object", it does not work at all on IPad, but still generates a double touch on Android (and works fine on laptop/desktop).
Confusing as hell. I hate, hate multi-platform rooted troubles!