DS: ADS and Artillery

I've been giving some thought to the comments that a few people have made
about how ADS should be capable of defending against artillery attacks, but
that how to resolve it in game terms would require adding FireCon to
artillery. I have a simpler solution to suggest. It may not be 100% realistic,
but it's plausible and playable, so here's a shot:
> From the comments in the original rulebook regarding artillery, it

ADS fire is only effective against artillery attacks when the center point of
aa artillery piece's fire mission falls within the effective range of the ADS
(I'll leave it up to individual players to determine if the effective range vs
artillery should be the same as against aircraft or GMS'). Thus an artillery
attack whose center point is outside this range, but whose beaten zone is
within it, would not be affected by an ADS.

For a closed sheaf attack, treat the entire mission as 1 attack against which
the ADs must defend. For each point by which the ADS defeats the artillery
attack, reduce the power of the attack by 1 artillery piece. (The reason for
this is that once the ADS has zoned in on where the arty attack is coming
from, it's easier to defeat the following shells)

For an open sheaf attack, treat each gun whose attack falls within the ADS'
effective zone as a separate attack (These missions have several different
angles of attack, and thus are harder to defend against), and the
effectiveness of the ADS is reduced by the number of guns it defends against,
just as with GMS'.

I'd be interested to hear what people think, and if anyone would be interested
in trying this rule out in play, please let me know how it works.