LOL, true fast forward can be a little weird, leave it as a bonus, the most useful would be timestop and backwards. (Btw Isn't the name of the movie Clockstoppers?) The timestop would work like this device where you could move things but still on stop, I don't think quicksilver's power would be...
The way i think is the best alternative would be: it could go backwards or forwards or stop in your own life (if go forwards: you just receive the memories from that time you skipped). With this power you wouldn't have any paradox consequences or anything like that but it would still be op...