the cup AUG is full auto only in game;
in real life it has a progressive trigger (light pull is semi, hard pull is auto)
It's impossible to translate this to a mouse click, but cup could add a semi-auto mode to approximate this and make it easier to shoot single shots
Code makes a possible reference to this issue - CUP_Weapons_Steyr\config.cpp: line 111
showToPlayer = 0; //Delete this if you want Single firemode for player
There is no correct answer for this and I'm sure some will have a problem with a semi-auto mode.