A proper idea thread should be done on a one-thread-per-idea.
If you have an idea, search to see if it's been mentioned before. If not, start a new thread about your idea, going into as much detail as possible. Think of the pros and cons of your idea etc
This way we can actually discuss and develop the idea and hopefully make it important enough to get into the game.
Wishlist threads tend to turn into a mess of ideas with no discussion or elaboration on any one idea.
Example of a great discussion thread from the PC forum:
http://community.sigames.com/eve/forums/a/tpc/f/5211026...272014482#5272014482