It would be really cool if Service Studio could allow refactoring of a single screen widget and its children into a webblock. Call it a new Intelliwarp feature ;)
You can find examples of this in Eclipse and (i think) MS Visual Studio regarding code lines: refactoring immediately creates a new method with the required parameters. I wish this could be implemented in OutSystems web screens as well.

woc.refactoring.web.screens.png