How many of you real golfers have been out on the course when the sun is not shining? Sometimes it may be shining when you start out, but 4 hours is a long time. The weather changes and it will start pee'ing down.
I got to wondering, have WGT missed a trick here. Are their design people cutting the mustard? Now, especially at St Andrews, which is in Scotland - and we all know it rains in Scotland 427 days a year - you couldn't play day in day out without some precipitation. It shouldn't be difficult to a good programmer to darken the screen, take out the shadows, and overlay some rain onto the pictures. Maybe even a puddle here and there (but no whirlpools please!).
Now anyone who has played in rain knows it is more difficult. The mind is not 100% focused on the game. You keep thinking "Why did I come out today!", and "It always rains when I'm winning". And you ladies probably say to yourselves "I'm glad I keep a spare pair of knickers in the locker". WGT could make your shots behave in a slightly less normal way, a 'rain beast' if you will, to go with the 'beast' they already have. You have to take more club, you can get splashed with mud, etc, etc (hey, I'm not going to do all your legwork for you, you know! I'm not the one getting paid to do it!)
Then there's the clothing. Rainsuits. And rain hats. That's more avatars to spend credits on. Umbrellas would be pointless because you are not allowed to hold an umbrella when taking a shot, and that's all we see. But, again, if you're not wearing a rainsuit when it's raining, then the 'rain beast' rears it's head even more often. Just like in real golf, one will usually play better in a rainsuit than shirt and shorts when it's raining.
Well, that's enough of my ideas, if you want any more you're going to have to pay me.