With the ever increasing number of zones and content with quest lines it is seriously time to adjust the quest limits upwards i will post a couple of ideas on how to accomplish this
1. Create and add a new category called "daily quest" with a limit of lets say "1" the daily quest count would/should not count against you current hard number 50 but be accounted differently
2. Simply add more quest slots
3. Add a "guild quest" section and have any guild quest go into that with a set limit but not have that count against he current 50 cap.