Firstly, thank you for the care that you put into nurturing and tending this community!
Looking at the badges - it seems that it may be useful to discriminate between posts made in the Ideas sections; vs. posts made in the discussion or the Weekly Challenge section.
My thinking here is that some folk will be able to make a huge contribution in new product or community ideas - while others may be assisting the community with solutions; suggestions; replies etc. Both are valuable and both are very different ways to contribute.
:-) additionally - like you've done with the weekly challenges - we could make this fun (e.g. use light-bulb or invention-themed badge icons for folks who are prolific idea generators).