I'm mainly saying to just simply remove the damage threshold (I personally have never NOT got a fine for FF no matter what weapons.) and make it a per hit thing. 1st hit is a warning that pops up a message like a fine/bounty. 2nd shot within the time frame before the warning expires is a static fine. Any shots after that in the same time frame are bounties and scale depending on how much damage you do.
Yeah. I understand what you are saying, and I think the obvious problem with your suggestion (and why FD did not go down that route) is that not all weapons are equal. One shot from a class one pulse laser, and one shot from a plasma accelerator will do very different amounts of damage.
Also, as I said earlier, FD have stated from the very beginning of these discussions that they believe that any kind of combat infraction must be a bounty, not a fine, i.e. you will become wanted. All bounties are now persistent (they have a timer that must count down before you can clear it by paying it off), whereas a fine can be paid off whenever you wish (it will turn into a bounty if you don't pay it off). I don't really understand what you mean by a static fine.
And I mean this with the utmost respect, but any suggestion along the lines of the one you are putting forward seems to assume that not only are you going to 'accidentally' hit a clean ship once, but you are asking for forgiveness for repeat offenses, and I'm afraid that the fact is, you shouldn't be doing it once, and if it's happening a lot, then a player needs to learn how to avoid it. Plenty of players do, and you really don't have to be an ace combat pilot to manage that, I'm sure I'm not one, and in the main, I manage to avoid it.