1. sure
2. yap, good idea
3. they are supposed to be hard, and some of them are literally unmanageable, so it may happen that they require non-combinable parameters... But personally I have never had a problem with agility - when I add flaps and optimize the wing size for fuel consumption, I almost always hit agility by a large margin... But I am currently reworking this statistic, so I will see how it works in version 0.6
4. yap, delta or straight wing + acrobatick wing profile + flaps generaly does the job, but i am working on it, so there will be big changes...
5. i soo it too, its aparently broken... will look at it...