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New group level config : A new config (share.snapshot.update.records.per.snapshot) per group, together with broker's value(as hard ceiling) is ideal. Groups without an override, would inherit broker's config. 
Broker level upper bound remains at 500. If users need any changes, they could configure both these configs.

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Note : There is another config share.coordinator.cold.partition.snapshot.interval.ms (default 5 mins) which forces snapshotting on a timely basis, but only for share partitions with no updates. So the old log recs of the idle groups would be eligible for cleanup.

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