Custom Program Tags and Email Performance Reports

Right now, I have multiple Programs set up with the sole purpose of emailing, but they all are parts of different sales objectives. As such, I've created a custom "Sales Objective" tag for each of these programs for sorting purposes. Although I can run Program Performance based on these tags, the statistics given by that report are largely useless for the purposes of these emails. I'd love to be able to run an Email Performance Report filtering by program tags, but can't find any way to do so (or for that matter, to do so without manually selecting campaigns rather than a search term.) Is this possible? Are there other ways to slice and dice email performance reports based on the type of email sent?