Hi Andrew,
Currently in the Cart you have the ability to use the Custom Ship Methods By Zip Code Shipping option which will allow you to configure Shipping Rates for specific Zipcodes however the option to control the Shipping Methods returned from the Shipping Calculators is not available. I do think it would be a great and useful enhancement. I have moved your post into our Enhancement Requests forum to give other users in the SC community to team-up and/or join your Enhancement Request.
We prioritize programming on our modules in the following order:
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Bug Fixes
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Sponsored or paid change requests
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Enhancements with the most requests
Thanks,