This will be very helpful in languages that do not use Roman letters in their alphabet. Romanization function that is used in XenForo is not mature enough for many languages. For some languages it results in meaningless strings that are neither human readable nor search engine friendly. Additionally, even if the Romanization works well for certain languages, often people may search for those terms in the original keywords in the native language instead of the roman form. In my forum along with Urdu tags users usually add tags in Roman form as well. In that case Romanization kills the purpose of the Urdu keywords.