Unfortunately its about the only logical solution that can be taken - They said in that same live letter that they cant tell whats on or running on your PC, and it would be illegal to scan for such without the users consent.

However, with the new presets system....Why not allow it so that marks cannot be MANUALLY placed mid-fight, but still allow it so that Presets can change the placements of markers mid-fight, so when you go from phase 1 to phase 2 in a fight, and you need new markers, you simply click on the 2nd preset and it swaps it over. Something like that would be good.