as posted by Jonathan Beebee:
The other function, display.newMultiSprite(), is used when an object has animation sequences that span across multiple image sheets. [Editors Note: Sprites and multisprites are now available via a single API display.newSprite(): http://docs.coronalabs.com/api/library/display/newSprite.html#multiple-sequences]
We really need the functionality to span animation sequences across multiple image sheets, and we think lots of games need this.
Are you planing to implement it soon?