umm... because that's a major insane job. You can hex edit simple things like systems and the like (which still aren't that simple)... but JEMM and the way Privateer manages memory are rather core to the program and they aren't things that can be changed easily (by which I mean, without an insane, cracked out, huge amount of work over a very very long time) without the source code of the various files. It's not like you're going through and using a relatively simple syntax, you'd be attempting to change parts of the basic structure of the code without knowing what each part did. It's nearly impossible to do, realistically.
TC