I'm not saying people should spam but actual genuine good ideas should be heard. Most good ideas eventually goes to page 2 which almost no one looks at.
Post that have over 20 comments become Sticky for a Week
This is a bad idea for the forums in all honesty. This makes controversial threads, usually with some sort of anger or insult flying around, be stickied to the front page. That wouldn't be a great thing to have sitting around on your website ever.
This also makes new ideas/threads be flushed off the front page much quicker. Only mandatory help or rules, or community-wide creations (treasure vault) should be stickied.
What if it was 25 post an a it then would be sent to an Admin? Plus how do we now Spiral Knights even looks at this a lot.
I was about to suggest upvoting, but then I remembered how bad Reddit is. Basically what Fang said, the most popular threads are often not actually the best ones, especially in suggestions.
As previous posters have said, the most active topics are not always the best.
Put another way, would you want the latest "SK DIED or no?" thread to be automatically stickied?
People would comment on their own posts..... nuff said.