This also has information on how to get Intellisense documentation: If you need to rename a behaviour (non-behaviour scripts don't matter), make sure to do it in Unity!
Setting this to greater than 1 can be helpful if you wish to compare the properties of multiple nodes at once.
If you have an hierarchy of objects with geometry attached usually when you click one of them it gets selected. If you click an object in prefab's hierarchy the root of this prefab is be selected instead.
And now you can manually force this behavior using Selection Base attribute.
Setting this number to high may cause performance slowdowns of the u Scirpt editor when multiple nodes are selected at the same time on slower computers. Legal Values: Checked, Unchecked Determines if u Script shows it's Welcome Window containing helpful links when the u Script Editor is run.
Default Value: Specified by the user when first running u Script.