Hey, this is Rai. Well I sent you up an e-mail as I've worked with this game before. I can tell you all about where the pointers are and stuff. Don't know if you got it yet, but I also told you in the e-mail about how I've already successfully implemented DTE into the game.
Though, don't expect to be able to insert the DS script with just DTE compression. Even with DTE little details might have to be taken out. But yeah, like I said in your e-mail, if you send me your hacked rom or a patch or whatever, I can implement my DTE into FE.
The reason I need your currently hacked rom, is so that I know which characters I can use for DTE. Obviously I can't use the English alphabet, but I can use left over Japanese characters for DTE values.
Also, the pointers for names and stuff, are stored right before them.
Now, having worked with FE before, I can tell you that there's really only one easy way to insert the full item names and that's by making a double line hack. I've experimented with expanding the menu's, but that makes the game glitchy and is just too difficult for me to make work correctly.
The only item name that won't really work with the double line hack, is Armorslayer, but we could split that into Armor Slayer.
I know the double line hack is possible, because KingMike did one for FE before.
Here's an example of what my DTE can do...