Feature Release: 3D Physical Buttons
Just push them! This is exactly how buttons work in real life. No trigger necessary.
The trigger is no longer used in any UI element, so you'll never place a vertex by accident.
Here's a quick animated gif demo: http://i.imgur.com/k4CysCr.gifv
If pushing it doesn't work, try the grips. Some trigger actions have been moved to the grip buttons, like the snap spacing slider and the Object -> Open scroller.
Finally, the pointer cones now reflect the current fill color for a nice visual reminder.