If you're feeling brave, you can edit the Poser.xrc file

(Program FIles/Smith Micro/Poser Pro 2012/Runtime/ui)

to create a key combination to do this. Make a backup first.

This is the chunk of gibberish you need to edit, the line in orange is what you could add as your key combo.

Did I mention that you should create a backup first? Make a backup.