Thanks for your reply.
Regarding max HR, my idea is that the max HR e.g. for a tempo run on a known route with target pace tells me something about my daily shape compared to similar runs. I might be wrong, but I feel this values is one of the quickest indicator when comparing similar runs and my own opinion of my daily shape, and might a bit more responsive than comparing e.g. VO2MAX values. Also if I e.g. has max intensity activity I think the max HR value tells me how successful and and close to max I actual was.
Regarding active and passive part; if I have both warmup, active part and cooldown in one activity file the average values aren't that useful. If trend analysis only evaluated the active parts (and ignored passive/resting parts) it would be more precisely. The alternative is to record different parts as individual workouts, but that's to much hazzel that it's worth it. So the question was if it's possible to e.g. have a ticker box to only evaluate active parts/rounds in trend analysis. But if the necessary data is calculated on the fly and not stored, it's might not that easy to implement?