Ok, time for my $.02
First, Viridian Lords are not broken. For 52 points per model get a two-wound man with a very solid CC and DAM output, a good armor, a sad RC and a just as sad LD.
The only good use of a Viridian Lord's throwing axe is to throw them the same action you charge. (Look in the throwing weapon rules.)
Second, why say the rane is 6? Aren't most thrown weapons 2+STR? This would increase their effective range to 8 if I'm right. If nothing else I would think it's 1+STR. Regardless, often the only good time to throw is when charging.
Third...the Two Handed Reaver Axe is not a Hand-held ranged weapon. IT'S A FRIGGIN' GREATAXE! We're not talking about a bow that you can hold in one hand and just requires the other to draw back the string, we're talking about big@$$ treemen lobbing axes in a way that would make Paul Bunyun proud! Even if throwing spears don't count against undead (which I think they should), at least the Two Handed Reaver Axe should.
Fourth...any arguement for Cursed Shot to be useful against undead is irrelevent. Barring the Shadow Tribe Unliving, only the Devout have undead troops. There isn't a single Cursed Shot that can be made from a Devout of any type, so if power can't be drawn from a fallen Devout then no power in a Cursed Shot should be capabe of affecting the Undead.
(Although with that said, I believe there should be Cursed Shot made from Mortal and Infernal Devouts.)