Hmmm ... I take it from your response that this isn't possible ... yet ...

So, let's expand the request:

<Dream Sequence>

Each object in a document has to have a name, type, and location along with other attributes.  It should be possible (if the general case can't be handled) to provide a standard naming convention for text boxes in relatively standard areas (title, instrument name, page (both top and bottom of page options, copyright info, etc).  The general case could be something like User01, User02, etc ...

Using "object" notation, a given field could be referenced:  "User01.page01.x = 10.00 inches" or something similar.

Alternatively, the text fields could be indexed  "User[01].page02.font = Ariel"

Inserting a new text box would be something like