How about the ability to script opinion of characters and other things like 'traitor' and 'reason to get jailed'? E.g. Magnus is a murderer because he murdered Knud in 1134, but characters don't remember this if you start in 1135 which would otherwise be punishable by law. King X divorced Queen Y in year A, as the script say, but Y's family wouldn't act accordingly if you started at a later start date a few years later. Duke Friedrich was commonly known as a traitor since the Great Saxon rebellion, but there is no way to have this scripted. The Hvide family are valiant supporters of one particular branch of the Danish Royal family, but this is not scriptable.
I think we need some kind of way to script in opinion modifiers to character in certain years and such.