Lephturn,
What you are suggesting is even more 'administrative' than the system I suggest. With that, you would have to rely on the FLs to keep track and then report to the central 'black-list' administrator on who needs to go on the list. Then the administrator would have to keep a record of that and compare it against people who sign up for the next scenario. Many of those people may have switched userID in the mean time, so they get in anyway. Then you have the guys who would be whining that they got black listed for no reason, that they tried to show up, but the FL didn't like them and never sent them any Emails or gave them a chance. Then there would have to be arbitration hearings so everyone could state their case.
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I'm not trying to ruffle anyone's feathers here, just making a suggestion that could help. No one says that it would have to be $5.00 either. Make it $2.00, maybe even $1.00. The whole point I am trying to make is that there should be some way for the hard-core scenario pilots to be able to sign up first and get in to a slot they really want to have, then let everyone else (the more casual players) sign up and take the rest of the open spots.
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Personally, I don't see why the whole thing isn't a little more like organized sports leagues. Prior to registration, you get your team together. When registration opens, you go down and sign up your whole team (and pay registration fees). Players that do not have a team can be put on an 'available' list and then chosen by teams looking for additional players. If enough guys are on the 'available' list, they can all get together and make their own team to register.
Just because this is an on-line game, people have this thing about it's not fair and should all be open. When it comes right down to it, your scenario 'squadron' is your team, and your FL is your team captain. Other players should be able to depend on you to show up for practice and make in time for game day. If they can't, you shouldn't even ask to join the team.