OK - as I mentioned, I'm afraid there's little chance of there being any further development into info via SNMP.
Are you using the SNMP option which polls the Meraki Dashboard as a single entity, for all Meraki devices in an Organization - of have you tried polling devices directly? (which is also supported)
API is the way of the future and not just for Cisco Meraki, I would say. Note that the calls which @Phil shouted up are both Org-wide: you get all the info pertaining, with a single call, covering all devices in an Organization - rather than needing to collect a list of all devices with an initial call, then iterating through that with a separate call, for each one.
Meraki have been looking to increase the number and variety of similar calls, where possible, as one way of reducing the number of calls required to gather useful info.