@hengst This house rules forum is full of ideas. To avoid scripted games you need a varaiety ways to win or lose a game in a reasonable amount of time ,eg 8 to 12 rounds.BBR and 3G40 are rulesets that encourage you to win by achieving various victory objectives.(not just victory cities)
3G40 changes turn order,merges Anzac into UKPacific,and sticks pretty close to oob rules.BBR is more complex than oob and is real popular.Both are designed to play in 1 day and to be able to declare a winner.