Ever since the 1.9 patch, the majority of mfg commands will not work with the exception of "/mfg expression" commands.

The three commands are:
*mfg modifier
*mfg expressions
*mfg phoneme

Modifier and phoneme are currently not working. I would like to know if Bethesda will be patching this soon. If not, why..?

Console commands are not supported and will likely not be patched.