The not wanting to nitpick is a good point. I don't know whether a more specific definition of troll would necessarily result in more nitpicking. If readers take "troll" by the stereotypical definition (like what ArisKatsaris provided over here and then somebody gets deemed a troll and censored for saying idiotic things without an intent to annoy (or for some other reason not typically associated with the stereotypical troll), then this could spark controversy, and you still get the nitpicking conversation. Verbiage like "anybody who trolls, but not limited to that" or "we think trolls are this that and the other, but not limited to that" may make any nitpicking conversations rather short. "We said it wasn't limited to that. End of conversation."