Manding languages
Everything on Wiktionary relies on thing having a code, whether it's for a language or a family. So there is really no way to depart from that convention without breaking everything, and having a code to use is a requirement for being able to do anything regarding a family or language. For example, the categories for language families are created with {{famcatboiler}}, which requires a code as the first parameter. So without the code, there can't be a category either.
That said, Wiktionary creates its own codes when there isn't one available in ISO 639. So if there is no code available for something, a new one can be created and added to our database. The database can only be edited by administrators, so you can request one at WT:GP and someone will do it for you. The reason I didn't do it myself is, as I mentioned, that I didn't know anything about these languages and I was confused by the fact that Wikipedia said man was the code for this family, while we already use that code for a specific language. Metaknowledge knows more about these languages, so he was able to judge it correct and added a code for you (along with some unnecessarily snide remarks towards me, just for trying to be cautious). In any case, for more information, you may find WT:Languages and WT:Families useful.