First, it should be mentioned that the GUI option you described is not available in the standard, free PDF Reader. That’s already an indication that the feature you are requesting is something of an advanced feature.
Obviously, Acrobat Pro is able to do that easily because it can run code on-the-fly to switch the titlebar’s content. But as explained above, doing it programmatically (i.e. as OL Connect is building the PDF) would require a bit of work.
I will log the feature request in our database and it will be prioritized. Obviously, the more users request the same feature, the more likely it is to be implemented.