I'm not sure what you mean all at once as Maximo wouldn't process 100,000 messages simultaneously even if you forced them all to reprocess. I would filter your list down to <5000 records and choose the action to process all messages and it will reprocess everything in your filtered list.
You could either remove the stop limit on MAXINTERROR (add it to the mxe.db.fetchStopExclusion system property) or bump your fetch limit higher (either bumping mxe.db.fetchResultStopLimit or create a new system property as mxe.db.fetchResultStopLimit.MAXINTERROR which would be specific to that object) but I wouldn't recommend that myself.