Your observations are quite valid for sure but in terms of a standard test case, one of the difficulties with WOFF is the randomness of events that can be generated even in a saved scenario. I guess what I am saying is that there is no way to have ctotal control of the test case and that can induce variance into the results. You are probably aware of this anyway but I thought I should raise the point for everyone
Possible only if scenario missions or custom mission file is created. If the file contents never change, then the mission will never change except for the AI controlled planes. If there are no AI controlled planes and you point to the same weather file (not the random dynamic one), then everything will remain the same each and every time. I have written numerous scenario files and the only random change is the AI reaction.