Hi a1lux,
at the moment charging flat fee of £1.25 per passenger over 4 passengers is not possible as it is quite specific and would not apply to many setups.
We can do that as custom development for you but we will have to charge a separate development fee.
Return trips are quite tricky. At the moment Return trips are considered as the same trip by the system with some waiting time between both trips and Tariff will be applied based on Pick up time.
This is why Return trip is just doubled outbound trip.
In the future we are looking to make Return trip a separate Order on the same booking with it's own Order variables and the customer will be able to select even a different car if the outbound one is not available.
But until this is done you may wish to disable Return trips so the customer can book 2 separate trips with the correct Tariffs applied.
Hope this helps.
Kind regards.
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