Basically stay away from argueing, don't post into suggestion threads. These are the ways to limit your 1 balls. Posting in suggestion thread will get you atleast 1 or 2 constant forum readers who 1 ball you every 12h. Just learn to live with it, I do :D
I can understand your first point about not arguing, although some people will still find a reason to 1 ball you even if you don't argue with them. But as for the second point about not posting in suggestion threads, why should someone prohibit themselves from speaking their mind about something they feel would make the game better? The solution isn't to let habitual 1 ball raters run rampant on the message boards. It's to find a way that achieves what the goal of the rating system was supposed to be without discouraging people from posting their ideas.
The plus option someone in this thread suggested seems like a good idea, but I would take it further and offer a simple thumbs up or thumbs down for each post. Rather than a 12 hour cutoff, make it so you can only rate a post once.