Depends what you define as "additional functionality" or "Renault specific." You can't turn the gearshift beep off for example on a mk3 RS for example with an RS tuner, but you can do with Clip. Nor can you reset a "crashed" airbag computer.
It DOES have extra functionality over generic readers & phone apps though. Airbag fault codes/removal, ABS/ESP/TCS faults, long/lat accs are all things that you can't do on a generic reader or phone app. But these are in the form of additional "modules" ontop of the base price.