No$GBA doesn't seem compatible with tablet pens for the touch screen. It works, but you have to tap twice to get a reaction from the game. Is there any way to fix this without changing emulators?

 

possibly a setting in the drivers for the tablet. i used to have a graphics pad myself, and used to be frustrated with havign to actually hold a button on teh sttylus to get it to work..i fiddled round with it's settings, and found a option to allow me to use it more intuitively like a pencil witout havign to hold any buttons or double tap, or whatever. im not sure how i did it, as it was some years ago now, but it is possible..