When we originally set up our class rosters, we did not add a criteria. I would like to be able to go back in and edit the roster to add a criteria.
You are now able to edit your roster's criteria after the roster has been created: https://community.blackbaud.com/blogs/97/6498
Thanks for posting this feedback so we could improve this feature for everyone!
I also would like more criteria when creating rosters other than just grade or birth date. Could we get more specific with membership type and/or constituent code?