RE: is there any chance of a cluster map in the future?
I have had pans to add one for quite awhile now… it has been put off until I’m done with the completely refactoring of the code to enable full support for the REST API which will be critical to properly support the radical new page editor WP is going to add.
Those maps are of a really limited usability anyway. Think about when you have personally used directories which had cluster maps. Did you really actually use it? I know I have not. I’m always searching for a specific location or a specific name.
RE: you should add the phone number line as part of the address so each address can have it’s own specific phone number attached.
I would suggest that they should be separate entries if they have different addresses with different phone numbers. Take McDonalds as example… you would not add all addresses to a single entry with all their phone numbers. You would add each location as a single entry because they are separate locations.
Hope that helps!