Interestingly it seems limited to wifi networks that implement the roaming extensions to 802.11. When setting up my network at home with several AP's throughout

Interestingly it seems limited to wifi networks that implement the roaming extensions to 802.11. When setting up my network at home with several AP's throughout the house I decided that, whilst roaming is nice, I don't trust most devices to select the strongest AP to latch onto after some trial and error, so disabled it wholesale.