Yes
I did two experiments:
Experiment 1:
Press A
Press upper left shoulder button
Press upper left shoulder button + A
Result:
KeyPress event, serial 38, synthetic NO, window 0x2600001,
root 0x3af, subw 0x0, time 124717, (171,-13), root:(177,23),
state 0x0, keycode 38 (keysym 0x61...