What you are thinking about doing won't work anyway. Submitting to the wrong category just means you don't have to wait as long ... to be moved to the RIGHT category to START waiting for the actual review (well, if all goes well, which when we catch someone doing this we don't worry as much about making sure happens.)
A lot of people think this way. The fact is, if it worked, we'd have to figure out some way to block it (to avoid the insidious effects of submitter-influenced bias). But the normal editing modes are quite resistant.
Think about it: Just for a moment, pretend the editor is a human being, doing this because he thinks it's a good thing to do. (It's always useful to think this way about people you see doing something good -- even in real life.) So I'm an editor reviewing sites about, say, Medieval Tocharian History because, duh, I think that would be an interesting way to enliven up a dull afternoon. What, do you think, am I going to do with a site on Lower Silurian Cryptozoid Coproliths? (whether or not it's submitted?)
(0) List the site immediately.
(1) Drop everything and go work on a Fossils category?
(2) Drop everything and go to a dictionary to look up four words that mean nothing to me as a cultural historian, to try to begin to guess where the site goes?
(3) Send that submittal somewhere random into the Science categories to be sorted out later by a Science editor, to a category to wait with various other submittals of the same site?
(4) check to see if the site has been submitted before; if it has, then whack it like a mole.
(5) drop that site into a 'grotequely mis-submitted' cesspool to be cleaned up later by some other editor.
In reality, those options are ordered by increasing probability, starting at ZERO, and ending not at all far from ONE. Because the last option is obviously the most efficient way to build up the MTH category, and ... that's what editors do, build up categories.