"I shape the tips sharper to make them STALL faster than the root"

This is the same purpose as the wing washout on full scale planes (not on aerobatics because of stated reason)

"If this is your first big kit--you may want to just sand the leading edges uniformly."

I will most likley follow your advise = stick to original drawing = uniform LE's. Obviously I don't want to risk my first 1/4 scale kit, and will instead concentrate on a light weight and best build I can come up with, and not manipulating too much with the aerodynamics of the construction. All the wing profiles (of a well designed rc model) uses well established wing profiles that has been developed by many engineers (in the 50's) that took into account Raynolds number together with other importaint aspects. The result ended up as several finished wing profile (that a model mfg choises when design their planes) that has a lot of work into em wich I will not take the risk of destroying. Obviously, with experience and knowing what to achive altering a profile there is no prop. However, with my limited building experience I rather not go that route.