http://iscoresports.com/

Is there a way to manage substitutions following Little League's substitution rules?

Could you be more specific as to what you need to follow? Certainly you can do substitutions, but what is special that Little League required you to track?

I'd like to be able to bring someone off the bench and when I substitute for them in the field, automatically substitute for them in the batting order as well.

You can make both the offensive and defensive change at the same time. It does require an extra tap because you have to make the offensive and defensive change both, but it saves time and confusion in the cases where you are also moving players around in the field when the substitution is made (as is often the case in youth leagues).