I was once forced into a 6-6-6 configuration, but didn't care for it. If I did anything, it would be the Stanley Thompson addition of a fifth par 3, and/or reduction of par 5 holes from 4 to 3 or 2.
Golfers like par 3 holes, so why not include more?
Most par 5 holes are boring (or at least the middle shot is boring) so why have so many? Would keep top players a bit less under par as well. Also, par 5 holes take up land (especially if made unreachable) and water, etc.
I always found myself wondering how the par 3 and 5 came to be, anyway. Felt they needed variety, perhaps? Two shots is all you need to set up strategy, which explains the dominance of par 4 holes.
Par 3 holes could be justified as useful in creating concept shots. Par 5 as a going for it in two variety, but you can do the same thing with short par 4 holes. Both perhaps necessary on rugged ground to get the course back or fit it in before earthmoving, of course.
Anyone ever recall reading anything about how those holes came to be seen as useful in design?