#1
You could add vampire related options but have them be disabled if the player is not a vampire. (Using a database of the vampire skill line.)
#2
You can add vampire related options directly (manually) using the LAM 2.0 widget API to the end of your options list.
If you use LAM to create/build your options list for you, then it will only do so when your addon's options window is registered and shown. Anything more advanced than that, and you get into advanced LAM usage.
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