Going back to the original question, (and in seeing the need to patch security problems) I think it would be very useful to have a built in autocaster. I have been using a 4 key, 1 hour gesture since about 8K exp, and used it to get to HoF. This being said, I have been in many tournaments using my gesture. Most of the time I come in around 10th, but today came in first against someone using a hud....I don't think using a gesture, autocaster or manually casting (as long as you are on top of it) make any difference in how you place in a contest. It's all about timing, and an official autocaster would mean that if it doesn't work, it is supported and will be fixed. It also won't be using an exploit in the system...so my vote is that it would be great to have an official autocaster that people (and contest managers) can turn on and off. Personally, I would allow them in my area, as I don't see a difference in who wins and who looses based on what their fishing method is.
On a side note though, with an autocaster, it would probably cause more people to reach HoF faster, and you might want to consider higher level achievements (I think I read someones post that talked about that)
Thank you to the Seven Seas staff for thinking enough of this issue to ask us about it, and not just implement it. That alone shows they care about the 7seas community!