Eating a sprig of wolfsbane gives you temporary immunity to contracting lycanthropy.

Make lycanthropic transformations non-instantaneous: you start to get messages 5-10 (or however many) turns before the transformation happens. For instance, “Your body itches all over.” This serves as a reminder if the player forgot or didn’t notice they had lycanthropy, and provides an opportunity for the player to remove armor to avoid it breaking.

If you are a werecreature in your were form, you can chat to monsters of the same form to tame them.

Rubbing a moonstone, or perhaps being in the presence of a lit moonstone, forces werecreatures to change into their were form, including the player if they have lycanthropy.

Since lycanthropy is an “abnormal” polymorph, dying while in your wereform kills you completely. (This closes off the silliness of turning into your wereform and throwing your weapon at yourself until you die and turn back to normal).

Possibly, weak lycanthropes such as wererats and werejackals should be removed so that getting infected by one isn’t essentially a death sentence.

Make lycanthropy less random in when it triggers, allowing the player to know clearly when an episode is approaching, but make the effects when transformed more dangerous to the player. While transformed, the player is overtaken and controlled by an animalistic AI, giving no control to the player until they untransform.

The chance of you catching lycanthropy is boosted on a full moon and zero on a new moon.

Reading a noncursed scroll of remove curse will also cure any lycanthropy you are suffering.

When something infects you with lycanthropy, the infector and all of its summoned monsters become peaceful.

Werebane provides protection from shape changers and immunity to lycanthropy while wielded.

Lycanthropy fixes:

• It triggers much more rarely, every couple thousand turns, but while you are in your beast form you lose all control.
• Or it triggers much more predictably, with messages making it clear that a change is coming, and the duration of the change is both more limited and more predictable.
• Or it triggers on a certain damage threshold or after taking a particularly strong hit, determined by your level, HP max, and phase of the moon.

The ring of protection from shape changers should apply to the wearer as well as other monsters; if the wearer has lycanthropy, they will not transform; if the wearer is a different shapechanger like a vampire, they cannot transform.