Accessign assets per page/part

[BigAlUK]

Not sure if this is an issue, more a feature request, or I may be missing something, but is there a way to reference assets on other pages or in certain parts of a page? For example...

At a page level: <r:find url="/banners/"> <r:assets:each> /r:assets:each /r:find

Or at a part level: <r:content part="gallery"> <r:assets:each> /r:assets:each /r:content