Future expansions etc. are not related to the game price. As we sad in the FAQ, many additions (like new historical missions) will be released for free
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Regarding hardware support, that's another matter that's been on the table for some time but we haven't reached a definitive decision. I can tell you that the first release won't have any special support for "hardware" like FS has, but don't forget that we have a "bit" more buttons, switches, keyboards, etc. than almost ANY aircraft depicted in FSX - even the most realistic ones.
While FSX has been having a long tradition of cockpit builders, it might be interesting to see how many of the (future) Shuttle "pilots" plan to build a cockpit around our game - considering that a full cockpit also needs 10 MFDs for some of the gauges alone + additional for visuals, not to mention several joysticks + hundreds of switches, buttons and rotaries. That would require us to make some heavy modifications to the game. As you may remember, the first MSFS did not have ANY hardware support so it may take us some time to provide that capability in one of the future releases - IF and only IF the market needs it.
Read a new poll that I will open in a few minutes
/Admin