Hi,
I have a suggestion for reworking how roundabouts are created and edited. Probably mentioned before, but I thought I'd stick it here just in case.
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The current way is to select a junction, and click Turn Into Roundabout. You choose the size, and click done, and it creates the roads in a circular shape, splitting by roads that overlap the roundabout.

I am proposing that when the roundabout is created, the roundabout's roads retain a sense of belonging to the roundabout object, so that the roundabout is its own object, rather than individual roads. Thus, you could later move / resize the roundabout without having to select each road and alter the geometry, and have the non-roundabout roads re-join up to the roundabout after it is moved.

Oh, and the ability to create oval shaped roundabouts would be good, because not every roundabout is a perfect circle...

Regards,
- Matt