Notifications - Timing

I have a user that has set his notifications to daily due to the number of notifications that he receives.  However, there are some tasks that he needs to receive when they occur instead of waiting until the next day.  My user has proxy for several staff members.  If he could receive proxy notifications separately (daily) and his own as they occur, that would be a good alternative.  Or if we could set notification for Certain types of tasks (from specific BPs or workflow steps) to come immediately that would be helpful.