You can't nominate a specific runway, but you don't actually need to. All extended centrelines are displayed and there is currently no special behaviour once a specific runway is nominated other than the pseudo-ILS kicking in earlier. It will still kick in when you reach your intended centreline.

Hi all,

While in flight I can use the "what's here" menu on my ipad to display the runway layout and switch between active runway in case it differs from skydemon's suggestion. How do I use this feature on my iphone as there is no runway layout available - probably due to limited space of the display.

Thanks,
 Oliver