I prefer Consolas as a monospaced font myself.I'd use it, if it wasn't so fugly!
I gotta add that to my "toolbox".
Here are a couple techniques I've used over the last couple years:
1) All papers that I hand in have to be double spaced. However, I set the line spacing to "2.2" - you really can't tell the difference
2) Same thing with page margins. Instead of 1 inch margins, I make them 1.1 inch margins.
It doesn't seem like a lot, but it really does add up!
Basically all you have to do is take advantage of the fact that TAs have dozens of papers to grade, so they won't catch on the "little details" that you add
I loved writing. Unfortunately, I was typically limited to a certain word count or page count
Instead of wasting time getting around limits, use that time to fill the space with useful work
Short-cuts may cut short your life (ok, that works better as a driving reference but you know what I mean).