>Do you guys ever add anything to your sugar water that is used to encourage wax from the bees?
No I don't.
>, have you ever put in a small amount of salt, or menthol or spearmint flavoring?
>And there is some talk about some sort of menthol affects the trachial mites...
you have menthol bags that release the fumes and the mites hate it. The bees dont like it too much eather and may try to cover it up becuase it burns their eyes. If they try to cover it use half the bag instead.