I think you should be cautious over marking some "feature requests" as a off topic question mainly because some of those can be actually answered and via some kind of magic, there can be something we can do. That is what Linux is stronger at.
Is there a way of... questions should not be automatically labeled off-topic. You just need to use common sense on those and mostly realize that you, as a person, don't know everything about how a solution can work.
I mean, if the question is "Can I have unicorns make me food every time I'm hungry butbecause I am too lazy to get my ass out of my chair, and feed me via the terminal?" common sense will tell you, "No, no you can't, cause even tough Unicorns exist they don't know how to cook!" and that makes it a lame question. Mark is as a non question and move on.
If its about applying real time effects to a Skype feed and have some fun about it with my friends, probably there will be some way of doing it. If its about removing the background change in Unity greater (lightdm) per user base, there will be an answer for that, even if you need to hack a bit.
Again: Use common sense. If you think its impossible or that the question is a half rant about some feature that does not exist, vote on it, mark it as a non question or a off topic feature request and move on. Don't fuzz about it.