Editing quick spell cast clickies

[dblair]

I find the profit ui extremely useful - especially for my healer classes. However, I would often like to change the 5 spells that are in the quick cast buttons. I have read about modifying certain files can do this - with varied results.
Could these buttons be modified to mirror the first 5 spells on a specific hotbar? Or make it so spells could be dragged and dropped onto the buttons - possibly being able to customize the 5 spells for each player in the group/raid?
Keep up the good work!