It is suggested to replace:
It is illegal to add a hyphen at a place that is not required by this
algorithm.
with:
It is possible to optionally add an y-hyphen between the consonants of any
permissible consonant pair e.g. for stylistic purposes or for the ease of
pronunciation.
I don't have the full context, but I assume the "y" would be permitted betwen the consonants of adjacent rafsi, and not between the consonants of any consonant pair at all, otherwise the morphology gets broken ("to smabru" cannot be pronounced "to symabru" for example).
mi'e xorxes