Currently, the RangeBeacons function will return UUID, major value, minor value, accuracy, proximity, and rssi. There are plenty of beacons on the market using the iBeacon protocol that send other types of data. Examples include temperature, humidity, light levels, etc. The inability to gather any of this additional information with FileMaker's current level of iBeacon integration has made the platform undesirable for several projects that I have encountered.
I understand that the ease of parsing the returned values goes down, as the number of values returned would depend on individual models of beacons, but I feel the extra information made available would far outweigh any parsing difficulties that might arise.