Add Primary Key to excel exports

It would be helpful to have the primary key added to the excel export.  I like to export to excel and do my magic using a lot of its features.  It would then be nice to be able to send/upload an excel sheet that would then include the primary key and all the fields with their assoicated values I want to update.  The process then would update my fields in bulk saving me a great deal of time and making for one happy client.