Hi and thanks for the nice words and the feedback.
I totally agree about the vortices - we are using "default Laminar Research" particle effects for now - I really want to update those, though - and make better vortices (at the right spot and only the right conditions) and also APU heat blur, fire extinguisher bottle effects, better touchdown smoke, etc.
I also noticed the flight-altitude problem with the mousewheel, I will enter a ticket for Tom to look at it.
I am not sure about the Vspeeds - we may have coded this so that the take-off v-speeds get erazed from the EADI speed tape if you enter the approach speeds. I really don´t remember how the FMS handled this on the real 737-300, I never did that ;-) It is also quite possible that the behaviour was changed, I am sure the Zibo is using a much more modern software standard for their FMS.
Cheers, Jan