You can only power it open with the key. I guess you could ask the dealer to see if itll program differently.
The sense behind it is that if you get to the car and press the button, it takes a while to open. In a car dealership, you have the time to wait for it to open because theres nothing better to do. In real life you wont and it'll frustrate.
Ive never found it an issue, in the car park I just stick my hand in my pocket and open it before getting to the car so I dont have to wait. And its closed by the time I start the car.
Just to point out, the new X5 does look pretty cool but has a lot of features missing which the RX F Sport has as standard including adaptive LED headlights, Heads up display, heated front seats, electric lumbar support, privacy glass etc.
An equivalent X5 25d XDRIVE would cost you about £57k mate + its slower and nowhere near as refined. Poor ride and road noise/wind noise is too intrusive.