I'm with Guido for the following reasons
By definition a round...... about is just that it is a round obstruction which is sometimes a physical barrier and at others a painted circle.
When we teach advanced standards of either driving or riding we should always set the example,we should always be 100% and not delve into grey areas where we get a situation whereby someone will say, "The instructor told me it was okay!" I can see the benefits of driving straight across a painted circle, and it seems daft go slow right down and navigate around this painted blob when there is no other traffic in the vicinity, but if there are other road users in attendance, then the roundabout is there for a purpose. Teach the correct methods and let others develop bad habits.
If we are driving from A to B then do we want to be stopped, hassled, or annoyed by plod? If we don't mind this aggravation and enjoy shooting the breeze with the boys\girls in blue then go ahead and goad them, but please, please do not complain when we get stopped for making minor incursions.
Onto my soap box
How many drivers, riders fail to look both left and right when passing through a traffic light that is showing green?
Treat a roundabout as a roundabout and give way to traffic approaching from the right.
If the highway is completely free of all traffic then why not straighten out a roundabout or drive across a painted blob????
Just remember though we are then developing bad habits and how many members have sympathised with the poster who had the wing of their car damaged by someone who lacked basic lane discipline when negotiating a roundabout? Bad habits are bad habits and we will get caught out. To see a vehicle slowly pulling into our lane and NOT take avoiding action might prove costly; for a motor cyclist it could be fatal.
As my old colour sergeant (he got promoted) used to say, "The day we pass our test, is the day we develop bad habits.
On another thread we debated 'eye contact' and once again I was in the minority.
I have just been out in the back garden sat in my wheel chair. My wife was stood to my immediate right and just four metres away. I asked her to tell me when I was making eye contact with her............ It was a farce. It is totally impossible for anyone to know what another person is looking at; impossible and when driving a motor vehicle, extremely dangerous to assume. I was looking at a patio door which was just to the left of my wife and yet she was convinced I was looking at her and that was just FOUR metres away. This patio door could have been a young 'dolly person'

An interesting object, dog, cat etc, but an assumption was made by one person that they had made eye contact. When we are travelling in excess of 30mph in a 1 tonne or more vehicle, then assumptions can be fatal, we should make assumptions solely on what we can see and not on what we think we have seen.
Phewwww
Rant over
Regards
John the olde grump