Right Click on Render Progress Window pauses rendering.
So how when I left for lunch I inadvertently right clicked on the Render Progress Window dialogue and my rendering paused for an hour and a half while I was out.
I don’t think this is a good feature.
Andy
1 1/2 for lunch, nice! 
I just tried and mine didn’t pause.
There is no Pause option implemented yet, it must’ve been something else that happened. By pausing did you mean that you could pause/resume the render job or it was just stopped?
Could you test this on a simple scene and give us step by step guide on how to reproduce it?