Marc,
The linearity of hedges is not the most pleasing sight on a golf course, much in the way that trees planted in straight lines detract from the overall visual experience. However, if it is going to raise eyebrows, then I'm sure leaving them intact is fine. But, I would be very hesitant to incorporate them into the design of the course. If they were to serve as some form of hazard, the problem of extricating one's ball would be a nuisance - slowing play, and infuriating golfers. Further, the uniformity of the hedge would make it difficult to accurately locate where one's ball entered, especially when running parallel to the hole.
Tyler Kearns