As for the idea itself, you can just as easily post a comment on a designers profile, but it wouldn't get quite as much response, I wouldn't think. And unless you were to spam developer's messengers with comments about a game you want made, that wouldn't be exactly easy, nor would mods like you for it. This isn't that bad of an idea, especially if the suggestion were non-specific (vs. something like 'another Blue Elephant game!' 'another Crush the Castle,' etc.) and all of the developers were able to see the suggestion and 'claim' it or something.
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