I thought there is no change to adjust electronic controlled fuel pump manually, but there is!!! Here is some instructions (belongs to an aftermarket intercooler installation):
I found some close up picture of the adjustment screw:
Ou yeah! I couldn´t resist the temptation and tried right now this trick. And yes, there is same affect than if you turn fuel screw tighter in manually controlled pump. I turned 1/2 turn clockwise and now it feels much more effective than like it feel after tuning-box installation. Now I can see a little "powersmoke" during full throttle acceleration when closing 4000 rpm.