mousePressEvent - Problems handling right and left mouse buttons together

[tbscope]

I was thinking there were two mouse press events occuring in the scenario I described, where the first is either a left or right button press, and the second event registers both left and right button presses. You make it sound like there's one event that registers a left click say, and the other registers a right click?

I see what you mean.
You can click the left mouse button and keep it pressed. There will be a left mouse button press event. It might be repeated too when holding it.
Now, while you keep the left mouse button pressed, you press the right button. There will now be a new press event for the right button.
They do not appear at the same time and the second press event is only for the right button.

You then want to check if both press events happened in a certain amount of time (if necessary) or just check if they are both pressed independent of the time.