Well, nemesis uses ps2dis to disassemble the MIPS Assembly so he can find the widescreen hexes with changing a whole chunk. But in order to do this you have to know the MIPS Assembly language.
Doing a whole chunk could work on some games, when I try to find resolution hacks I edit a full chunk at the same time and when something changes then I go one-by-one until I find it. I always have a backup because your game can get really messed up when changing all of those values.
The only person who found a text hack was VIRGIN KLM, he found a cheat for Kingdom Hearts II (not hex edit) to make the text 4:3. He tried finding the HUD but he believes that it can only be found through hex (I think nemesis is going to try to find the HUD hack for Kingdom Hearts when he has the time to).
I'm no noob, I just don't post much :P