If that's the way you want to play flyers be my guest.  I won't do it - the air rules already draw enough attention away from the real game.
As for the Support Craft rule, I am not suggesting we can't change it.  I am saying that I am personally not in favor of changing it.  The abstraction doesn't bother me (nor does it seem to bother the majority of players) because even the unit's position is an abstraction.  Of course, I hate to rain on the naysayer's parade but every single one of your unit positions are abstractions.  When your infantry are 5cm apart they really aren't spaced 5 men tightly together then a break, 5 men tightly together and then a break, etc.  They are strung out and covering that area in between the unit stands.  So
technically when you get to 5cm you should be close combatting somebody.  You also have to have LOS to a unit even though LOS to a point between the units should be just as good.  But we all deal with
those abstractions.
And combining the distance abstraction to the Support Craft abstraction makes no sense.  You are multiplying X times Y without knowing either value then telling me you know what the answer is.  Just plain silly.
Support Craft represent a very small percentage of the Tau army, an even smaller percentage of the Dark Eldar army, and don't even appear in other lists (yet).  Its effect on the game (positive, negative, or otherwise) is nominal and as such the RAW is simple enough to be digested by anyone and should be left alone IMO.  If it ain't broke, don't fix it.  As mentioned before, I agree that the
designation of a specific unit as a support craft may be questionable but the rule works fine.
I guess we'll have to agree to disagree on this thread.
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author of Syncing Forward and other stories...It's a dog-eat-dog world, and I've got my Milkbone underwear on.