I have to agree that Falcao's is probably about as good as you'll get for a real time ABS. It's an incredible amount of work to do, especially for a program like RPG Maker that isn't exactly an industry standard. It always amazes me what some people are willing and able to do.
I also don't think this is something you can teach in a tutorial, not a quick and simple one at least. I'd take a look at Falcao's and see if you can make that work for your needs.