The key mapping still works. I prefer the UK layout, e.g. (which has the vertical return key instead of the horizontal enter key in US layouts). If I connect a

The key mapping still works. I prefer the UK layout, e.g. (which has the vertical return key instead of the horizontal enter key in US layouts). If I connect a UK keyboard and use US mapping it still works. Generally, though, I always try to get any English layout, instead of a European one and map as I desire. For macs that would be English International.