The "Spirit Weapons" patch is something that only makes the slightest bit of difference if you're playing a Totemic Druid: Normally, your Spirit Animals have their melee attacks rated as Normal weapons, which means there's quite a lot of stuff in the game that they can't hit. The Spirit Weapons patch raises the level of enchantment to +5/+6, depending on which animal you get.
The patch can be found
here.
As to the ethics of it......It's certainly more than I would have done. True, the Spirit Animals are way too kickass to be wandering around with pansy-ass Normal weapons, but.....+6??? I just don't see a Level 9 Druid summoning a critter that can hit the Lesser Demon Lord. I would have set the enchantment to +2 or +3 and left it at that.
As to whether it was "a disaster" as far as potentially corrupting your game, I doubt it. Bugs are almost impossible in such a tiny MOD, and Sorcerers.net isn't known for hosting buggy wares anyway.