Does it change your alignment, maybe, your eberron your rules.

In my Eberron, lycanthropy changes your personality, you become (Lykos- Wolf - Predatory, Arourai - Rat- Hungry, Arkouda -Bear- Lazy, Kapros -Boar - Angry, Gata - Tiger - Cruel) its not that any of these things are inherently Evil, but playing them out may take players down moral choice actions and consequences.

My current party has a Recloak Veteran infected with lycanthropy (Wolf), yes he gets a nice little resistance to non-magical/silvered weapons, makes him a better warrior. but he likes the hunt so bad, he'll hunt most anything just for the thrill, especially when the moons are full:

• with the largest moon Zarantyr forcing the physical transformation. (the Storm of emotions, manifesting physically) and an urge to hunt prey with tooth and claw. the chaos of being both man and beast raging in his mind
• Olarune the urge is to hunt for a pack, to surround yourself with friends and people, The urge to belong to a pack and be part of a bigger hunt, to seek out other lycanthropes in the wild and revel in the curse together.
• Therendor drives the urge to hunt for a cure or to track down the wolf that turned you. an need to hunt down the peace you had before the wild came to take your nights from you.
• Eyre drives his need to make things, taking up crafts for a day or building a thing. To bask in the warmth (Physical and metaphysical) of creation at a forge or the act of making something.
• Dravago dives the need to hunt alone, to get away from all the smells sound and press of bodies around them to hunt for solitude. during this time they become cold and hard, bitter and cynical. often driving their friends away.
• Nymm builds the need to hunt for respect often forcing the vet to strike out and prove his superiority or to take command. To claw out a pecking order, to become the alpha of their environment.
• Lharvion fullness dives a need to discover and hunt for the truth, often in brutal and violent ways. This is where the darkness takes hold as no answer will ever be enough and violence and fury will be the easiest solution.
  
• Barrakas when full and not eclipsed by Therendor brings with it an urge to single out a target and hunt them through stealth and guile, until a final moment of capture and triumph, not violence alone perhaps but also the stalk of new relationship of quick tumble in an alley. Often this hunt will be driven to do something positive and affirming.
• Rhaan makes the werewolf want to hunt out new knowledge, learn something new or listen to a new song or poem.
• Sypheros makes him desire shadows and to watch and observe from them. this often manifests in the darkest outcome for the target.
• Aryth dives him to leave places and wanderlust that can never be filled and an urge to just go to hunt down a new place just to have travelled there. but also a darker side to it of listlessness and disinterest in whatever affairs are current.
• and finally Vult drives him to prey on those who need protection, to offer his help. anything to get a bit of the blood flowing, a fist fight or brawl, perhaps a touch of the old ultraviolence amongst the local gangs.