add an option to automatically block any text message containing a word or phrase of your choice. it should also block any source containing the phrase as well. example; setting the phrase ".com" would be able to block people sending you text messages through email accounts.

to add this to the menu you would need only to create sub menus under "blacklisted". to get to blacklisted numbers/phrases you would navigate to, "settings > blacklisted > sources" or "phrases" then to add anything to either list just open up the list and tap the + symbol to add to the list.