That I can't help you with...I'm not smart enough on WWI aircraft to help there...
Honestly, that depends on the actual aircraft. Remember, back in aviation's infancy, they were still trying out a lot of stuff...especially when pushing aircraft to the edge of the envelope. And small changes could make for big results.
Again, depends on the aircraft. I will say that I think most aircraft back in the day could recover from a straight stall. The problem was always if one wing dropped off first due to torque effects, a bent airframe, etc. Then things got nasty (ie an unrecoverable spin...).
Well, depends who you talk to. Simulations in general have difficulties emulating post-stall behavior, because of the odd dynamics (vorticies, turbulence, etc). Also, even good designs can have odd quirks that don't show up until operations.
Several examples:
The early F-100s had a nasty yaw tendency, corrected by increasing the vertical tail size in later models.
The early F-4s had an ugly tendency to get into a spin at high AOA if you used the aileron.
The F-15E can get into an auto-roll couple in certain configurations.
The B-1 is not recoverable if it gets into a stall (doesn't even have to spin...just a straight stall).
Most aircraft of the WOV/SFP1 area had thin wings to go fast. Thin, fast wings have a much different stall characteristic than big, thick cambered wings (like your Cessna).
Cambered wings' stall curve tends to be very well defined...increasing AOA results in increased lift until near stall, then you get buffet, and then pitch down as the wing hits max Cl.
Thin, fast wings on the other hand have a much flatter Cl curve, and start buffeting very early. Also, there tends to not be a definite nose drop, just increasing buffet, and increasing sink rate. This characteristic killed a lot of early pilots who normally expected a nose drop and never got it.
So, with that being said, the SFP1/WOV/WOE seem to feel 'ok' to me...but remember, that TK programmed the engine probably for docile behavior at the limits...get 95% of the feel correct, because the majority of his customers won't be concerned with the other 5% of the envelope.
FastCargo