I would prefer auto closure of completed missions once a new one will be taken. I never had real problems with the limit concerning open sessions, though sometimes during fame mission campaigns, some more might have been handy. Yet there are a few missions which "fork" in course of their progress instead of simply proceeding to a new mission step. Such missions may be disrupted by a mission number overflow.
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Daomei die Streunerin - religionsneutral, zivilisationsneutral, gildenneutral