script to to give player mod options when beginning game?

[3mjolnir3]

I'm trying to make a mod where the emperor is still alive and the oblivion gates never happen, that lets you play in cyrodiil before the invasion. But I want to give the player the option when loading the mod (in a little window maybe) to either use the mod content or stay with the default game, that way they dont have to turn the mod on/off whenever they switch characters. Is there a script/cs quest package I can use to toggle whether the player uses the mod content (all changes in the esp) or remains with the default game upon loading the mod?

[DrakeTheDragon]

If those changes were scripted, an activation/choice popup would be a piece of cake. But if they're record-based, hmm...