Addons and creating unique urls for iframe.html

[buggedcom]

I'm creating an addon tab that catesian maps a set of props and creates iterative instances of the story to test all combinations of the props together. We then have a test runner that takes screenshots of this page. However two things are stopping me upgrading to 6.4.x.

• The ability to link to an iframe.html page. For example the standard canvas pages iframe is http://localhost:9009/iframe.html?id=app-components-actions-button--button&viewMode=story&args=. I want to be able to specify a different viewMode to invoke the add on content, for example http://localhost:9009/iframe.html?id=app-components-actions-button--button&viewMode=variations&args=. I can't seem to be able to do this.
• The ability to give my add on tab the ability to be linked to. For example the tab updates the URL to be http://localhost:9009/?path=/variations/app-components-actions-button--button, however refreshing the page redirects the URL back to story mode.

Any ideas or pointers where to look to update the code?