I support the idea of a requirement for leaving Silan, but not necessarily tied up with any of the missions. Just as an idea: how about requiring toons leaving Silan to have done the following:
- Edited or created one custom stanza
- Cast one spell with magic amplifiers equipped
- Killed one mob (any mob)
- Harvested one mat
- Crafted one item
- Learned any spell with a "heal hp" effect