Along with the spending and taxation sliders I'd like the option to lock-in an approval rating. So, say you lock in an approval rating of 75% or 100% the tax rate will automatically adjust the tax rate turn to turn to maintain that approval rate. I really hate having to go and micro-manage the tax slider to make sure I haven't slipped below the pop growth rate bonus levels or even under-tax so I am way over the target rate without the extra revenue....
