I actually choose to give less structure to the idea submission thinking that there could be many kind of ideas so a less structured submission could be better. But actually I'm not that sure about it. Maybe there are some questions that should apply to all kind of ideas, so I could separate those and let a general field for the ideas that don't apply. When you say that people may not take the time to review ideas you mean that I made it hard with all those fields to fill or that in general is a lot of work to read an idea think about it and suggest improvements. The disclosure problem is probably my biggest question at the moment. So I need to test what would convince more people, but at the moment my biggest problem is how to get people to visit the page since with no user I can't really test my assumptions.

Thank you for your comment, it is really useful.