by the amount of vertex mods i already saw i guess it pretty stableThe reason they probably haven't yet is because it's very unstable and/or tedious
if not they may should release the source code so people could take a look at it and help in development
same as it was with brawlbox with brawl
new methods and tools where released as soon as they worked
and so as all people got access to it and could development further
just saying it would speed up the process of sm4sh modding if most of the information wouldnt be hold back