It could be helpful to be able to select from document structure information to update a custom field of a TM.
Let's say I use the bilingual excel filetype and choose a column for rererence information that would appear in the document structure information column in the Editor. When updating the TM after translation, for each new translation unit the field would be updated with the according value read from the reference column in excel. In subsequent projects you could apply penalties to such field values.