Since Dynamo player launched a few weeks ago, I have been having a lot of fun with it! Mostly because Python nodes support User interface additions!
Recently, a colleague needed to rename elevations based on level and room location. Very quickly I realized this needed to be done by isolated the elevation heads (views).
That’s when I went ahead and created this little gem (now available in Rhythm).

This node allows the user to pick a category to isolate, and select objects of that category by a crossing window or individually.
And here it is in action with Dynamo Player.

Have Fun!
-johnP