I've been getting quite a few requests for this-
http://www.stilesmusic.com/qkpt.html
Import this into QuickKeys (You can download a demo of QK from their web site
http://www.cesoft.com/products/qkmac.html ). It's a sequence that bounces memory locations to disc. So... highlight the area you want as a bounce, create a memory location selecting "make selection" (?? i think that's the prompt), then make as many as you want to BTD then hit "F14". NOTE- in the QK editor look at how I made the sequence, I've allowed for 12 memory location bounces. I just copy-paste/cut the the actions to allow for how many BTD's I have. Before you hit "F14" select BTD and make sure the settings and location are what you desire.