Are you using European or American version?
If your version is the European one, and you say that it's Multi-4 (four languages: English, French, Italian and German), probably the American version has two languages: English (for americans and canadians) and Spanish (for mexicans and the rest of latin america).
Well, at least in american version of Metal Gear Solid 3, there's English and Spanish. And both ZoE and MGS3 are made by Hideo Kojima, I presume. Try it out.
Actually, I am doing both versions. Back when this game was done, Konami mistreated Spanish language real bad. MGS had an awesome translation and voice acting job, but because Sony payed it, as Silent Hill 1, MGS2, SH2, had awful translation jobs.
Back to topic: European version has the four languages, American version has also the four languages, but the Italian part is not completed and I presume that the other three languages have been disabled by code because not the whole thing is translated. ZOE1 was NOT translated officially to spanish, and I've verified it.
On a side note, I've released the patch in both versions, but I still lack of the autoselection on the European version.
EDIT: And I still don't have a clue on how to use the debugger. ZOE works kinda odd though.