But godot operates way different, I don't think you can really compare that. Imagine poor Ashley sifting through 3000 suggestions :D
I'd say it would be ok to limit it to 1 (or maybe 1-3?) suggestion per user but only if Scirra then responds to every suggestion in a reasonable timeframe (~1-2 months?). So you'd pick your personal most wanted suggestion, and then you'd get a guaranteed answer as to whether it will be considered or not. Either way, once you have the answer, your slot would be free again for another suggestion if you want. So users focus on what they really want and there's a limit to the amount of possible suggestions floating around in terms of workload. I can see though why Scirra does not want to actually give definitive answers to the suggestions and rather keeps it in limbo.
I'm actually personally running relatively low on new suggestions, and I'd rather see added robustness to the existing stuff. Aka more exposed ACEs, added functionality etc.