The way I handle this at the moment is just to have lots of presets of adjacent stations and flick through them when reception starts to go down the toilet - manual AF

If/when you do implement it Hugo could you add the following feature. My head unit allows you to manually trigger a rescan, which means that when the reception is going to hell in a hand cart, but the head unit hasn't spotted that it is bad I can press one button to force it to rescan for a better signal.