Quests are not hard-coded into the game. You can certainly make new quests for both online and offline usage. In fact, they host a quest editor over at schtserv.RyoDC wrote:Does quests for PSO have some interchange format?
Can I extract quest data or made another quest?
I've rised this question on schtserv forums but guys said it almost impossible to made a new quest, because they are all hardcoded in a game.
That said, it is not exactly easy to make a brand new quest, and requires a lot more work than you might expect. Especially, if you want to be compatible with the earlier versions of the game.