Presently it is only possible to change the calculation method and percentages of the HR, Power and Pace Zones.
When following a training method which uses different zones this is not really helpful. Personally I use 80/20 Zones, which are not supported by the present garmin setup.
An extremely useful feature would be for the user to define how many different zones are needed and the ability to define a one character name to the zone (not be limited to a number but alphabetic too). This feature should apply to specific sports - like the present zones setup does now. Factory settings can then be whatever the devices presently have.
This should be possible as the present power zones on FR955 has different number of zones for different sports (Bike:7zones; Run:5zones)