I don't know whether this has been discussed before, but my top priority would be to see Parachutes for German aircrew in 1918.

Given that several German aces, e.g. Ernst Udet, Paul Bäumer and Hermann Göring, would not have survived the war without resorting to their Heinecke chutes, I think it's not an unreasonable request. If the feature were to be implemented it would be nice if it was prone to failure as it was in reality (Rumey and Loewenhardt were killed as their parachutes failed to open).