Player invaded Sarawak after having India declare war, landing an infantry corps. No dialog box announcing any "outrage" or penalty, nothing reflected in the turn review, probably because he used India, rather than Britain. Almost all Axis players invade Yugoslavia before the coup, even though reality dictates that the Germans expected Yugoslavia to join the Axis prior to the coup. Disabling the ability to DOW countries that are pro your side (i.e. more than 0%) prevents anticipating the coup with a preemptive invasion, stops players from invading friendly countries for mpp's or to preempt expected enemy invasions, such as the Allies invading Burma, Sarawak, Solomon's, or New Guinea, to preempt Japanese "Pearl Harbor" invasions.
If players are going to completely ignore history and the political situation of WW2, why bother playing a historical wargame?
If too many folks object, can it be made a check box option like removing diplomacy spending?