I don't know if you're still looking for a solution.
You may already be familar with our tool for Crystal Reports called ".rpt Inspector Professional Suite" -- as of Feb. 2005 we've released ".rpt Inspector Enterprise Suite" which is designed to Mass Edit + Manage reports, instances, and schedules in Crystal Enterprise.
So now you can open your reports directly from CE and it will automatically pull in all CE properties. And you can find, analyze, and manage failed / successful instances (i.e. create a new instance based on information in failed / successful instance -- or modify some or all of that information).
Plus a lot more like ability to modify your schedules (i.e. formats, destinations, database logon, parameters, etc.) instead of having to recreate them. Plus all the edit features of .rpt Inspector for the Crystal Report side.