Sneaking and Hiding NPCs?

[ChaosSlayer]

Question: is it posible to tell npc to hide or sneak? Specialy if they rogues by class?

I know that giving npc air elemental spells will make it cast invis on itself, but is there any other way?

I belive there were some hiding rogues in Dulak Harbor on Guntak they would suddenly appear and attack. On other hand they could have been just trigered trap-spawns

Overall it woudl be nice if npc rogues would all be hiden until you agro them

Also I belive back in Crustal Coverns (or Dragon Necropolis?) the phase spiders were actualy able to become invisable while attacking - it was imposible to fight them wihout see invis ability

do any of these work or can be implemented?