>(1) Is there any way to tell if someone is submitting my domain to other categories to mess my chances up?
No. But what would it matter? You should worry more about what your ex-wife is doing with your old fingernail parings, hot wax, and sharp pins. Just the act of worrying will shorten your life more than both of the malicious acts together.
>(2) Also, my site is broken down by regions /states (
http://newyork.plugstar.com ) If the dmoz editor checks a new region will this neg effect my chances.
If you don't submit the separate regional subpages, and you don't make attempts to conceal the relationships between them, then there's no reason for concern about the chances of the main site.
Really, you're the only one whose actions really need concern you. If editors make mistakes, we can work them out. But you can make mistakes -- such as deeplinks of subpages with shrouded relationships -- that are difficult if not possible to work out. And, note well, this can happen EVEN IF YOU DON'T SUBMIT THOSE OTHER PAGES AT ALL! Because, remember, editors are by no means limited to site suggestions -- we can review or compare any site we can find by any means at our command.
The simplest thing to do is make sure all your pages' interrelationships are public and honest. That way, however our editors find your pages, and whichever pages they find, they'll always be lead back to the business home page -- which is what we want to list.