I know its not a HUGE deal, but I noticed something:

I haven't checked the other applications, but in assemblies, I suspect that I have found a bug/problem....call it what you will.

First off, I am using SW 2015 SP5.

In assemblies, you can apply standard mates using the context toolbar:

AND you can float the Property Manager window to a convenient location.

So, here is the issue:

I floated the property manager window to a spot on my second monitor.  Then I hit the little Pushpin to lock it open.

Then, I CTRL selected 2 components in my assembly (Specifically: 1 cylindrical face from one component and 1 cylindrical face from another component) and the Mate Context toolbar did not show up.

I was wondering why, when I Deselected the pushpin on my Property manager window and then tried again.

This time the Mate Context window shows up when I select two components.

The context menu does not show up at all in assemblies when the Property Manager window pushpin is pushed in.

I can repeat the behavior over and over.    Is this the same in SW 2016 and beyond?