Hi! Few ideas for you:

1) tie tasks & roles with each other i.e. add visibility to roles & tasks associated with it e.g. let user highlight every role & task with a color;

2) add auto-reminders for tasks sensitive to specific time e.g. send e-mail;

3) add option to make some roles & tasks visible in report & some not e.g. to extract information which could be shared with boss & other separately;