Grant -
You are illustrating, and personifying, why it is rather prudcent to hire a professional and well-respected golf course architect to guide you through these decisions.
We are doing some expansions and they are all a part of a master plan and startegy done by a GCA.
In at least three cases, the addition of short grass will present more challenges:
1. Our 3rd hole: Par 4, 450 yards. Green sloped from left to right significantly. if you miss right, the ball is stopped by the rough today and presents the player with a rather benign, short uphill chip from just a few yards off the green. With the edition of short grass, that same miss will produce a 15-25 yard chip. Easier? Perhaps not.
2. Our 5th hole: Par 4, 400 yards. Two tiered green with rough (our course has no aprons) around the green and a gentle fall off of 4 feet behind the green. When a player misses long, the ball stops in the rough before the slope and presents a very easy revovery. The addition of short grass will see that ball release down the slope giving the player a 10-15 yard chip over up to the putting surface. Easier? Perhaps not.
3. Our 10th hole: Par 4, 440 yards. Downhill tee shot and approach to a very flat green. Lots of players have a 190-210 second shot that comes in low, flat and sometimes hot. With rough surrounding the green, the ball stops quickly and makes recovery easier. We intend to add a grass run-off for another 15 or so yards the way William Flynn drew it up. That smae miss will then go over the green and make for a more delicate shot to try to save par.
You get the point.
Get a GCA involved and have some fun!