Add an assignment box into the slayer interface. Have the assignment appear in game chat instead of a prompt.
I do not support the ability of extension or preferred assignments. Players will choose highly sought after bosses. This would cause higher players to camp bosses that lower players are using for gear. It would potentially discourage players from trying. Also, this would have a slight impact on the economy.
I support the removal of the ability to permanently cancel tasks for free (legendary donator and above should still be able to tho) . And I only support this if the ability to block tasks gets fixed first