Welcome to the Org!

The information about altering the game dates should be answered in the MTW modding forum.

You should be able to at least browse the posts there but will not be able to post questions in that section until your Org membership is granted. Just keep posting questions or useful replies in the Entrance Hall until that happens.

Revolts in your own armies? Some might consider disabling these (even if it were technically possible, which I think it isn't) as a bit of a cheat, since it's an aspect of the game you simply have to be able to deal with.

There was a recent thread in the Main Hall section, about Civil Wars and How to avoid them. Have a read of that and see if it helps.

There is a well-known feature of the game whereby you're offered the 'minor victory' after conquering 60% of Europe but decide to continue and go for 100%. Somewhere around the 80% mark, rebellions spontaneously break out right across large sections of your empire. This is apparently hard-coded into the game by the makers, so as to not make the final stages of the game into a too-easy walkover for the player.

You might be able to avoid this by activating the auto-taxes feature, which ensures loyalty will stay above 120% in your provinces. This is enough to prevent re-emergenges of eliminated factions and should help prevent rebellions too, though I cannot guarantee that.