Adding support for CustomComponents in Vaadin Visual Editor

As we are using Vaadin more and more in our company, we like to figure out which is the easiest/fastest way to create UI. We were very amazed that the latest version of the Vaadin Visual Editor supports CustomComponents within the toolbox.
But there is still an issue: All Core Components can be configured and have a real appearance and can be configured depending on there possibilities.

Is it possible to provide such a configuration for our self build Components?

I saw there is a configuration for the core components in: