I dont know if its possible, and realise it might not make it in before 4.3 goes gold even if it is..
Can I propose adding a [[H* Header_Text]] markup where * is the Header level impemented or something similar if possible, it would prove helpful for importing from v3 PB and or other external sources and would make for a speedier conversion/import of resources.
I am (Not) going to create a PB as it would need >30000 headers if I do the job correctly, and whilst its relatavely straight forward to mark up the txt programatically before dropping it into Word, it is definitely not pheasable to manualy set so many items in Word..
also maybe markup for styles bold,italic and underline, but thats just the icing on the cake