A lot more changes in the code than just the opcodes. The opcodes changing is just sony's way of saying that the client is radically different than before. The opcodes haven't even changed much since febuary when they changed them all around and we went to 5.5 but theres still been 3 or 4 paches since then that break the code. Patches also change the format of packets that get sent out and what data gets sent when. There is a lot more changes than you are thinking, but its still possible to merge the new changes with 5.5 files to get 5.5 with newer features added. You can do it, but it requires you being able to figure what how to tell what changes are new features and what changes are for different versions of the client and selectively merge the code.
Oh and I don't think you can run EQ very easily from a DVD because it requires all the files to be in the same folder structured the way they are and it has to write to a lot of the ini file in its root directory. If you can set up a DVD Rw as like a virtual hard drive or something so that anything can write to it through the OS you could probably pull it off, but it would lag a lot when EQ needs to write soemthing.
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