It's easy to respond to the eurocontrol consultation. Don't be put off by the form. No need to suggest specific wording changes, just make the case against any action that would 'impose or increase' the costs of recreational light aviation.
Bearing in mind that the people who decide will probably not be aviators, but economists - think about what you say. Target comments at the detrimental effect any new charges would have on the benefits light aviation brings to local economies and on the already hard pressed aviation industry (where are they going to get pilots from if people can't afford to learn).
Might also be worth raising the transaction costs involved in any mechanism for charging recreational VFR flights.