Originally Posted by wonder squirrel
Which button? I've tried both, each one, scroll wheel, scroll click
The only buttons you need for the QTEs are E, SPACE, Right Mouse and Left Mouse. A red icon indicates you've hit a wrong button too early. Are you pressing anything when the cutscene starts? There aren't many where you have to press repeatedly either.
edit: btw you CAN bind mouse 4 and 5, i was clicking on the "keyboard" part of the bind screen DURR (keyboard, mouse joystick binds are separate)