http://iscoresports.com/

Have any of you used multiple IPads during a game? Is it possible to synch them together during a game? Or can you merge the stats after?

You can not use multiple iPads to score a single game. You can transfer completed games between iPads using data sharing, but there is no way to merge stats for a single game scored on multiple devices.

Any chance this might ever be a feature?

Maybe some day if there is enough interest from the user community.