yes, Task system always will be good, i have 2 suggestions
1. It would be nice if the player could select the difficulty, I.E. Rotworms Task (Easy 30, Medium 70, Hard 150, Very Hard 300)
2. The player could make some mixes and create his/her own tasks selecting the monsters of tasks already killed (max 3 maybe) . I.E. i already done all tasks of rotworms and dragons so i can make my own task selecting Rotworm and Dragon on tasklist
Lke the idea