Not sure about that. I understand that many people like to mod their game and have things customized. But on the multiplayer part if you open such a possibility you totally our control how far it can go. I have experience in many multiplayer games on different platforms and I believe that the more equal the environment for players the better the experience.. The answer is that it's not likely we'll enable any mods on the server. But hey, soon we'll have official P-51, Bf109, FW190 cockpits updates!
1. Strange thing. Does it happen on other servers? Probably should be address to ED Spitfire bug thread.
2. DCS feature, Burning Skies does not have any special scripts on labels part.
Currently Open Beta version is euqal to Release version. They are equal up to a single bit of info. However when Open Beta will be updated further, the server also will be updated. We recommend to use Open Beta client for Burning Skies. Reason why it is so were explained earlier. In brief - it's for faster bug discovery and faster fixes.