Actually, the FSD cooldown thing on submission to interdiction was never intended to be used as a quick getaway. It was put in because of System Authority Interdictions. They scanned you and then you had to wait a minute while your FSD cooled down. It was never intended that Players would submit to Pirates and then run. So guess what, FDev has cottoned on to that and they're going to change it. How is yet to be decided, but something like leaving the Interdictor running for 40 seconds after dropping out of SC. You can choose to turn it off, but whilst on, the Mark's FSD is in lockdown mode.
I do hope they also do something about the damage interdiction does. Aside from an easy way to run away people also submit to avoid costly repairs... It would ALSO be nice if the authority vessels messaged you when when they establish an interdiction tether so you KNOW you're to pull over. I mean, usually a cop will signal you that you're to stop, not ram you off the street only to check your drivers license.