It was asked in alpha too. Until they fix it bind your keys (I use num - and +) and just keep in mind the lowest speed is 2 levels down from normal filght. So, whatever your sim rate, just press - for 8 times and the 2 times + and you should be at normal rate. Anyways, from what I noticed more than 2x speed starts buging badly with autopilot on.
Cheers!
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