Spawned some B-29s repeatedly to test some things out in SEA II on Friday night after FSO. Every time I spawned a B-29 only engine 1 was running. The others were off. I had to select all engines to start them. This happened 3 or 4 times every time I spawned a new formation.
Might be a bug or oversight, where a single engined plane starts that engine, rather than selecting all to start.