Hello,
Unfortunately, this kind of modification will not function well in many parts of the system. There are hard-coded limitations and we didn't really foresee someone might be extending that particular CommonData array.
While it's possible to apply necessary changes to make these new statuses work in places like applets or status change leightbox, we currently don't have plans to include such feature.
If this is something you feel is really important for you in EPESI, please let us know how you'd like to see it done. What statuses did you add, how would you like to use them? Perhaps the Projects & Tickets package would fit better your requirements? It's available for free, included in EPESI package (as of version 1.3).
Kind regards,
Arek