I think we should start in a simple way, just another tab for people to make posts with their ideas, then it may evolve. But for now my suggestion is just for a place, more stable than twitter or telegram, for ideas to be thrown.
I don´t think it should be very complex or difficult to participate. Each of us think in a different way and a form requirement or many prerequisites could throw people away from participate. Ideas don´t come clear everytime and I think they should find a place even if they are imcomplete at first.
Maybe it is a good idea to make it required to be tagged, only so they can be easily filtered. Tags could go from "brain fart" (or a more formal tag) to "serious proposal"
The three types of votes is a very good idea. I don´t know if this voting system could be used for shorting the posts within the tab, so the idea with most rockets would go to the top and the most disapproved would go to the bottom and likely be ignored...
Also that tab can serve for people to post their technical improvements or hacks. That way the whole ecosystem can keep growing and improving.