i have the official 7inch screen, but did not test touch inside emulators never used it nor needed it. I did test latest scummvm (1.8) on raspbian on pi2 with the screen attached and touch does not work there. Display works fine for the rest as well, i think i tested it with retropie 3.5 on a Pi2, a PI3 should not be diffrent.
pitft is not the official screen and i think OP was refering to the official one, if not i’m using the official one.
Screen works fine in raspbian as well but you’ll need an updated image or update it yourselve before using it.