Not really, you would have to wire two smaller packs in parallel. This isn't hard though.
Also, gearing for the same speed each time:
A 4S 5000mAh pack (74Wh) is the same as:
a 5S 4000mAh pack (74Wh) which is the same as:
a 6S 3333mAh pack (74Wh) as far as run time should go.
So, up the voltage, but still keep 5000mAh, and you'll have the same runtime as a massive capacity, lower V pack. Also you should see efficiency gains over the lower voltage, due to the decreased current
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