I've spent my time working out a more elaborate system to support custom components. Now it is possible to define variants, label anchor points and labels more formally in XML format. It is possible to load XML files with a whole library of custom components that will show up like regular components in the help, intellisense, etc.

This is incredibly useful for common graphical symbols that are rather specific to the environment that is being worked in. Libraries are loaded automatically from the browser local storage to make sure you don't need to re-upload everything all the time.