I think an option where if you start a new thread, those who are on your "ignore" list are not allowed to post on your thread. This would be an option for the op of every thread before it posted to be viewed. It would save the moderators a lot of time and effort. Plus keep some of the more frequent trolls from derailing threads with their own agenda.

I disagree. Having the option to block certain people from posting on your own thread would be very beneficial. There are certain people who go at it with one another just because of personal reasons which have nothing to do with the post. There are also certain people who have hatred toward certain companies and bash everything said positively about them. For instance, never mind, I'm not going to drag any specific names into this discussion. If I were to post a for sale thread there are a handful of people whom I would not want to comment on my thread and by simply not allowing them to derail your thread would eliminate a LOT of back and forth banter.

How do you interpret this as way too much power? Seriously, I'm not saying to be able to pick and choose who posts on YOUR thread, just to have the option of eliminating a limited number of people who are constantly going after each other. It would be an option
for the "op" of a thread. You should have the right to choose whether or not you want to block someone from your ignore list from crapping all over your thread. This would also help the moderators and you and I as a reader

Then you don't have to use the option, I for one would use it and I would appreciate my right to do so

They would be removed from posting at all. This comes into play in the "For Sale" threads especially. I'm not talking about someone who doesn't like this, or that. I'm talking about someone who has some personal issue with the op and takes a huge dump on the thread just because they can. What good does that accomplish? It's along the same lines as cyber bullying and if there were an option to eliminate it altogether I would use that option. Feel free not to utilize the tool if you disagree but don't dismiss it altogether. You might not want the option but others will and it's a win win for some of us.

How is it misused? The people prevented from posting are already on the ignore list. I'm not saying you can pick and choose who posts on your thread.....

I get what you are saying, I do. What I'm talking about is if someone has already had an issue with someone else and it has risen to the point of an ignore option already utilized.
I'm not saying "I don't like what this guy said so I'm going to block him" type scenario. What I'm suggesting is that "a furtherance of negative banter be prevented by the option of an ignored user prevention of posting feature." They are already ignored by you and now can't post in your thread to ruin it.....
Just an option, a check box when posting a new thread