I have a few more suggestions for the game:
1. People with 99 Slayer should get higher level tasks like Nechryaels, Abyssal Demons, Bloodvelds, etc.
2. People with 99 Agility should be able to acces the advanced Gnome Agility course.
3. Make the spawnrates for monsters like Bork or Kree'arra faster.
4. Place a cooking range close to a bank. The way you have to do it now isn't usefull since your fire dissapears after only one inventory.