Don't know if anyone else has noticed this, and perhaps it is just me and the Stearman I am flying at the moment.It appears to me, if I trim the pitch on the Stearman for level flight at full throttle, then invoke the "skip" to the next point function, I lose the trim I had put in, and have to trim it all over again...

Yes, and you may be at a different ALT (higher/lower) and there may be some wind changes (increase/decrease). Planes need to be trimmed constantly due to many factors that will be encountered in a flight. I'm not sure how well those factors are modeled in Flight though.

Yes I agree, but I feel pretty sure after playing with it some more that all the trim input I have put in is zeroed back out after using the skip function...