The 'free' spy report option is unbalanced. My uber-spy countries have survived FSes more than once because they just couldn't op me in a reasonable number of turns - even if you balance it so that you have to have a high spal to use it you're giving one free op a day to each spy country which after some initial probing they can use on the opposing spy countries, effectively killing the defensive advantage of spies. Spies are expensive to maintain because they're so specialized and operative defensively and offensively. Other than that you've got some interesting ideas.

Particularly the market bribe. I would see that needing to be moderately expensive so it's only useful on rare occasions but it would make turn around in the event of an alliance getting jumped that extra few hours shorter. Could really make warfare a lot more interesting.