If you've ever used Screencast-O-Matic and Arc (soon-to-be Canvas Studio), you'll notice that the screen recorder in Arc/Studio is the same recorder in Screencast-O-Matic. It's fantastic! However, one important feature lacking in the screen recorder in Arc/Studio is the ability to create a scripted recording. This is easily my favorite feature in Screencast-O-Matic and I would love to see it come through into Arc/Studio.
With the scripted recording tool in Screencast-O-Matic, you can type out your script or import from a .txt file, record your audio first, and then record the screen part second. What you're left with is a polished and well-rehearsed screencast video that your audience will truly appreciate.
Read more about Scripted Recordings in Screencast-O-Matic.