Here are my two suggestions: Releasing a nation If you have a annexed nations you can release them and play as them. From what I know, you can't even leave during a war through the diplomacy screen. There is no easy way of getting out of the faction during war. The /f disband faction=you command can be used to forcefully disband/delete a faction. You can build anywhere, change the faction leader without being leader yourself, claim and unclaim anywhere etc.
When in admin mode you bypass all restrictions. The most important admin command is /f admin on/off=flip. You will receive a link and will create a new password via email. Lost your password? Please enter your email address. What are the conditions that need to be met to be able to do this, and how do you t. In the new Hearts of Iron 4 expansion, man the guns, it should be possible to take over leadership of a faction.