Back when I used to play Jack nickaluas Golf on the SNES it had a function where you could pick holes from the 2 different courses to create your own course.
Suggestion:::
1. Have the computer create a par 36 9 hole by making holes from Bethoage and Island course or an 18 hole par 72 on the setup screen.
2. In multi-player the person initiating the game would pick either a 9 hole course equalling a par 36 or an 18 hole course equalling a par 72.
By having a feature like this it creates a challenge of not knowing where you may be able to make up a shot or two with the holes that are upcoming. Also can eliminate some of those score killing holes like #7 par 5 on Bethpage or #15 on Bethpage.
As courses are added this feature would always keep the play new by mixing and matching.