Well, if you are following StandardAI's personal war, you've probably come across the "banned" thread... I'll quote GG's reply from two weeks ago (this is specifically regarding veng'ing your mirror self for fun and profit)
"It's really important that you guys know that we didn't ban people who hit upon this exploit accidentally or who were merely trying to complete the mission. We banned people who did this intentionally and on a repeated basis. We have complete logs of everything that these players did, and it's enormously obvious who was trying to exploit the bug and who wasn't. Those who were not, and even those who were simply marginal, were not banned. If there was even the slightest question of their involvement in intentional exploitation, we left the account unbanned. In other words, only the worst abusers were banned."
The exact choice of wording says it clearly. You basically have to be a total idiot to get yourself banned for botting. My guess is you have to leave it running 24/7. (there are professional bot farmers, scary but true.) I
highly doubt you'd be mistaken for a bot. Bots zone and re-zone in a nice, predicitible pattern. If a human were doing the exact same thing a bot was, it should be apparent. You'll pause. You'll check friends, you'll chat, you'll pause for food/bio breaks, etc. But nonetheless - wiggle and dance anyway. Just because...
(GG from the "bot policy" thread)
"You report them, we will attend to them. That's a promise! support.guildwars.com. (We dealt with more than 100 today alone. 
)"
Meaning you
could theoretically get caught in a wide-cast net. Obviously they won't disclose the method they use to detect bots; that'd be really stupid as the bot coders would just make slight modifications to their tool and it'd be undetectable for another couple weeks. I'm sure as we speak there are "humanized" versions farming and chatting and... and... they might be in your PUG right now!!!
