We started a session of posts in our blog about the selectors.
The way that you can use a WebEditor in Sitefinity 4.0 is different from this one used in 3.x. In Sitefinity 4.0 you have to use ControlDesigner and all data is sent to the client component. In 3.x we used WebEditor attribute and all data was get/set with server side code and post back.
We will consider your suggestions and expose a way to use the base selectors easily.
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