Realistic Waterfall Generation

I have played this game for just a hair under six years, and have enjoyed every second of it. However, there has been one thing that has been bugging me for quite some time now. That being how unrealistic the waterfalls are. I would love to see rivers generating on large cliffs, with huge, majestic waterfalls flowing down them. At the bottom of these waterfalls could have rapids that would stretch in for a certain distance depending on the height of the waterfall. These rapids could occasionally spawn on their own, being most frequently found near more extreme terrain. The currents in these waterfalls would be very strong, and it would actively push you down until the water becomes more still.

In contrast to these larger waterfalls, I also would love to see small creeks and streams flowing through forests an plains. These creeks and streams could eventually feed in to larger lakes and rivers.