For legal reasons we are not allowed to take ideas or suggestions from outside the company. (We can’t even read them, actually). As a developer, taking ideas isn’t what we do. A publisher is who you would want to talk to.
That said, we welcome your feedback our on games. You can e-mail us, Tweet us, Post on our facebook page, or best of all: join our forums. Our team regularly checks and responds to all of those methods, and we’re always taking the community’s feedback into consideration as we develop our products.