Hey, Zarj, You have no idea how much satisfaction one can obtain from finding out things by himself

.
The only people which could help with this are developers, which rarely visit this forum (Vengeance?). If You don't care about satisfaction, I think that again You should try catching somebody competent on irc.
Those things really are possible to discover, look in the database and xml files (sometimes peek in the source code), patience and persistence are the keys

.
If You change the name of NPC, its quests will stop work, because quest scripts relay on npc name.
There are more then one table involved in quest processing. Check
-> this thread for some information about programming quests.
Have You discovered server console yet ? You need apache + php with mysql support. Source files of web interface are in directory "www" in PS source tree. Console will allow You to do different things to npcs (I'm not sure what features work atm).