Style nit. Please new-line and indent on the API calls so these are readable without scrolling in the IDE or here in the github UI.

public static final SimpleAttributeDefinition SUPPORT_ATTRIBUTE = new SimpleAttributeDefinitionBuilder(ModelElement.IDENTITY_STORE_SUPPORT_ATTRIBUTE.getName(), ModelType.BOOLEAN, true)
    .setDefaultValue(new ModelNode(true))
    .setAllowExpression(true)
    .build();