It could become a good example of how to add a option to an existing report… both the tweak for the GUI and for the underlying code.
But how would you interface the option? It could be a true/false of ALL types or just Primary.
@Mattkmmr just did an extended selection option for Event types (collating built-in and custom types) for his Heatmap addon web pages report.
He hasn’t said when/if he intends to release it. But the method should be fresh in his mind.