[Plugin: Sharedaddy] Annoying 'sharing_disabled' custom field appears

For some reason you have set your plugin’s postmeta without a starting underscore (‘sharing_disabled‘ instead of ‘_sharing_disabled‘). As a result it is annoyingly showing up in the custom fields drop-down on the edit post/page form, even though you already have the setting as a separate meta-box.

Would you be able to correct this?

Many thanks.