First add new FRMs to ROOT\DATA\ART\CRITTERS\CRITTERS.LST, i.e.:
NABRWN,11
NMDOCC,11
MADEGG,58 // default list ends here
RESERV,11 // new shit starts from here (RESERV to keep the list order if we want add something later on, before what we added after it)
RESERV,11
RESERV,11
NMBMAX,11...