Probably the BEST feature I've added yet to increase the speed that you can do things with Boxer.

When you get to a polygon and you are drawing stuff, when you are done with that current Polygon CLICK your Middle Mouse button
This will create and select a new polygon so you can keep drawing without going back to the other view to have to right click make new polygon and then back over to do it

This + enter to skip to next frame should make for a lot of production value :D