I stay in Cruden Bay and love the course as it is. Having said that, I will admit to daydreaming whilst out walking the dog about changes which could be made to the course.
Combining 15 and 16 is an interesting idea although it would make for a completely blind approach shot (not that that would be a deal breaker at Cruden Bay). You could also move the 15th tee to the top of the dune just to it's right (which I think was the original tee?).
I like the idea of a tee right on the beach at 14 and moving the green forward. The winter green sits high above the fairway and is in a beautiful spot and it has made me wonder what it'd be like if that was the summer green. Although you'd lose the bathtub green and I certainly wouldn't have the courage to do that.
The first time I saw the 9th I didn't like at all but, strangely, I know find it to be my favourite hole on the course. I can't really explain it I just love the view from the tee and also that moment when you crest the top of the hill and look down towards the green, with the sea and far end of the course way beyond.
I don't like the 12th. Although this is purely because, no matter what I try, I hit my tee shot into gorse. Every time. So that hole could quite happily be changed. Ideally they'd be able to make a much longer par 4 and have he new hole playing back alongside the sea - that'd be great. And the 11th does get very close to the 13th so I could understand if they did away with it in favour of the new hole permanently.
There have been a few changes in recent years (aside from the new 19th at the far end of the course). The 3rd has a new championship tee about 80 or 90 yards back. The angle of the 7th has been completely changed - the tee is now to the right of the 6th.
Anyway I wouldn't be brave enough to change anything - the course is fantastic as it is. These are just some musings when I'm out with the dog.