Use case: A library would like to offer the option for patrons to request a loan in ebook format and process through the Occam's Reader addon. We have set this up as an option with an Item Info field currently, but it would be helpful to be able to use Document Type where this info seems to live more naturally. The other workaround considered was changing the default loan form for GenericRequestLoan but this seemed like a lot of extra work (include_menus, OpenURL Mapping, Validation, etc.) just to add a new value. So if we ever get to make changes to ILLiad this might be helpful as more libraries implement Occam's Reader.