Mapping this one with the fully pedestrian semantics would result in separated sidewalks, and barriers having to be mapped.  My gut feeling is that the artefacts resulting from the transition from normal sidewalks to separated ones, would, in my view be worse than the current situation.

However, I think it is fair to say that there is no sidewalk across the central reservation.  There is a crossing, with dropped kerbs, but it is set back from the junction, so I'd consider it to be an island crossing on Nash Way, rather than the sidewalk on the roundabout.

There are sections of pedestrian safety barriers on the North sides of the roads near this junction, which is one reason why it is  impossible to cross where you would expect "pavement around the roundabout".

The island crossing does need mapping,  and I'll try to do that in the near future.