1) Somewhat. You should be able to modify the script more to your liking by editing a couple lua files.
First open "FECsummary.lua", and change "WAR_MINIMUM_STARTING_TURN = 76" to something like "WAR_MINIMUM_STARTING_TURN = 0", or whatever you'd prefer. That will allow open warring to occur within Axis/Allies restraints.
To then disable scripted diplomatic actions, open "FecScript.lua". Go through and delete all the table entries for "g_Major_Diplomacy" and "g_Major_Minor_DoW" so that they both match the "g_Major_Minor_Peace" table (which is already empty).
So when you're done it should look something like this:
Code:g_Major_Diplomacy = { } g_Major_Minor_DoW = { } g_Major_Minor_Peace = { }
To allow completely open warring, without breaking other things like the calendar/tech tree, would require more complicated changes. You could try deleting all the lua files, and see what happens. I guarantee the calendar will break, but the tech tree is something that I'm unsure about.
2) Unfortunately, I'm not too sure what it definitively takes to get Japan working. I have gotten Japan to be playable before by deleting units that they spawn with. So my thought is if a unit spawns on a portion of the map that is viewable by Japan at the start, then deleting it would probably help.
thanks im now able to declare war/peace as well as make friends w/ impunity. tech tree works fine as well. will edit if game crashes or if smething goes wrong.
nbeav54


But there's something that REALLY pisses me off.I get the "Assertion Failed!" when loading your custom map , so i tried to "set up a game" on my own.The mod looks perfect except that i can't build a single military unit...
the resourses required for EVEN the infatry are INSANE!!! Is there anyway i can fix that? 
Thanks anyway i'll stick with my set up games for this mod but if you could suggest me a mod/cheat which makes the resourses(especially strategic ones) never end , you'd be helping me A LOT!
.It's just that 1 day i bought a LEGAL & SEALED! copy/box of Half Life:Anthology from wallmart and steam said that "the activation code is already used" or something like that.And since Anthology is a Steam-version only i couldn't even play it offline/single player
.Anyway thanks, though there are limited things i can do now...