I think he was pointing out an alternative.
That said however, as plentiful as MW is, its rather pointless to add scripted vulnerability to silver weapons in my opinion.
Out of the some odd 10+ People i've PvP'd with, only one had no magic weapon. I'd much rather face numerous people with silver weapons, than 10 people with magic weapon, because atleast against silver, steps can be taken to protect from it. (Namely: Ghostly Visage). That said however, NWN silver weapons aren't legitly silver. Its cold damage vs. Lycans, if i'm not mistaken. Which brings in a whole other bag of worms. Would Protection from Elements work against it? Silver is, after all, an element.
Though its at the DM's choice. If they wanna throw it in, go for it.
As for the issue with Hold Person, there's a level of psuedo-metagaming I've encountered. I've never, ever, ever, ever, ever, ever, ever,ever,ever,ever,ever,ever,ever,ever,ever,ever,ever,ever,ever,ever,ever,ever, ever,ever,ever,ever,ever,ever,ever (etc.)seen someone attempt to Hold Person a Chosen. Yet when I'm PvPing people, the hold wand, or hold spell, is one of the first things they run for. Granted i'm usually packing 3 alignment buffs, If you're gonna throw the one hold person at the PC lycan, throw them at NPC lycans as well.
Belladonna is a whole other can of worms. Its a poison akin to arsenic for Lycans, but also poisonous to humans. However it has to be ingested to be a poison. Otherwise it just gives nausea i've been told. If you try to force-feed a werewolf poison, don't feel bad when he removes your hand. Then you go into shock from the blood loss, then are eaten alive.
Again, The DMs have the final say. Its easy for me to be biased, as I am the only PC lycan at the moment, so the balls in your court.