I dont know if you can do this with the newer models but with the older ones you can get a spare wheel and ditch the runflats.
There is a kit that can be purchased from Mini which includes a space saver wheel and a carrier that mounts under the boot at the passenger side.
On the earlier models there is a large plastic cover in this area that is removed to enable the wheel to be sited. This might still be the same.
This cannot be done on S models as the exhaust runs up the centre leaving no room for a wheel.
If needed the wheel can only be used on the rear, so if you get a puncture on the front, you move the good rear onto the front and put the space saver on the rear.
erm... no 
