[ANSTHRLD] crowns/coronets in armory

[Alden Drake]

Are there any regulations on what kind of crown/coronet a current/past 
king/queen can include in their armory beyond the usual duchy, county, 
baronial coronets (as depicted in the coronet laws for coronets as they 
are worn)?

For example, could a past king register a badge that included a crown 
like this: http://www.heraldicclipart.com/catalog/coronet%203.html ?

Also, can nobles register armory using English coronet styles in lieu of 
SCA coronet styles?

And what about mural crowns and naval crowns?

Thanks,
Alden