I'm glad this thread is back on track. With that being said, I do believe that gelatin use is completely up to the brewer. Gelatin needs to be put into a cold beer, so crash cool your beer right after you know fermentation is complete (stable SG for at least 3 days). Then, keep that beer cold for a week. During that time, you may be very happy to see that the beer has clarified to your liking. If so, no need for the gelatin.
If it's still not clear enough, then add the gelatin. Either way, you're going to want to cool the beer down for a while before adding the gelatin. This helps bring out the proteins that would cause a "chill haze" in your beer. The gelatin need it to be cold in order for them to successfully hunt down the haze causing proteins and drop them out of suspension. Another few days with the gelatin and you'd be set to bottle or keg.