Well, in this case, probably not a hidden gem but definitely something I didn't know.

While working on a bit of a project that has me looking deep into Vixen 2, I notices something.

Did you know that you could snap gridlines to the nearest 45 degree angles?
<Ctrl> <left mouse button> Starts a normal chase line.
<Shift><Ctrl> <left mouse button> Starts a Snapped chase line.

I'm hoping there's more I stumble across.