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Ah, ok. In that case I'd suggest something like that:

Уважаемые граждане! Убедительная просьба исправлять мои ошибки в русском языке строго в порядке их поступления. За дополнительными справками...

You're right in a sense that intonation means a lot in Russian and could be used to convey very different meanings. However, there's often a better way of saying the same thing. Another better...

I'm not sure if you've done it on purpose, so if you have, you can safely ignore what I'm going to say.

If all you want is to ask people to correct your Russian, you should say something like:
...