Option to have blocks added to a pagetemplate be "for this page" and not shared

[jstemerdink]

A client would like to use a page template more as a structural guide. So when they create a template and add some blocks to it, it would be great to have the option, when creating a page from the template, that the blocks used on the template can be for "this page only" and editable for that page only, instead of a shared block. I thought putting a "block template" on a page template would do that, but this results in when you edit the block template, you edit the content on the pages made with the template it's used on and vice versa. Mind you, this is the CMS 11 version still