Here again you've asked a question relating to dancing or the teaching thereof, where in fact my answer is going to relate more to the technical aspects of building this website.
The matter of rise & fall, along with many other various dance techniques (sway, alignments, etc) will ultimately be addressed in the man's & lady's breakdown charts. At the moment this isn't the case because when I designed the format originally, I wasn't planning on going into that much detail. There were (and still are) 4 columns: Step #, count, general description of the step, and notes. The notes column will occasionally contain information regarding alignments, turn, rise & fall, etc, but only in specific circumstances. It will continue to stay this way until I overhaul the layout.
Once I do, I will present the information to the user in one of 2 levels of "difficulty" (based on preference settings): Simple and technical. The version you see now will be the "simple" model (default). "Technical" will contain all of the extra details one might want to know when studying for an exam, eg footwork, rise & fall, alignments, amount of turn, etc.
In addition to the charts, there are two other places where technique can be found: The overview page for a dance step, and the opverview page for an entire dance.
As far as rise & fall for Foxtrot and Waltz is concerned, I will probably take advantage of both of these locations to discuss it. The description of the overall difference between Waltz & Foxtrot rise & fall will be best suited for the dance overview page. The pecuiliararities of each step will then be discussed in either the step overview, or the technical charts.
And as I mentioned before, if you or anyone reading this would like to take a stab at helping us write some of these descriptions, we'd be more than happy to add them to the website.
Regards,
Jonathan Atkinson
www.ballroomdancers.com