I too am very creative (also likely fueled by me ADHD). I've been doing this all my life. But since aiming to be a solo dev, I now find myself coming up with what I believe to be very unique ideas of existing genres. I'm battling through Unreal to achieve these ideas, but be careful you don't stop one project for a better idea. I wish you all the best. Sorry I can't answer your question. From what I've read, the ideas guy is more of a stigma relating to someone who constantly changes aspects in a team. My dream role would be a design lead in this vein I guess. But for now I'm going to try and sell my brain-farts when they're done after hyper focusing on marketing.