Can the accessory terminals be used (programmed) for multiple speed control fans? (G, G2, G3)

Where a typical home furnace only has one contact for a fan stop/start, a fan coil system may have multiple stages of fan speed. Many thermostats will operate automatically to stage up the fan speed for cooling, or a manual switch may be offered to determine which speed to run the unit at. I notice the Ecobee does not have specific fan speed terminals, however I was curious to know if the ACC terminals can be programmed to do so?

ecobee3 Smart Wi-Fi Thermostat

ecobee3 Smart Wi-Fi Thermostat

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