Bluebeam Scripting (specifically BalancePages)

Brad Samuels

BalancePages should have a function to allow you to insert your own PDF. InsertPages has this functionality, so it isn't too far out of the realm of possibilities.

Use: Making sure documents are always even or odd by slip-sheeting individual PDFs prior to combining.

Having the possibility of IF/THEN statement in Bluebeam Scripting would also open up a lot of possibilities.