Whether CON is factored in depends entirely on if you have autosets for NPCs implemented. An NPC itself will have HP/Mana/MV based on their hitdice, manadice, and movedice as set in the area file (or OLC).
If you have autosets, check your OLC files to see how those stats are calculated.
MOB's do not get the bonus from CON to their HP, correct? It looks like their HP/Mana/MV are all generated before their stats are. Is that correct?
Arholly