quickly add time to tasks on the project page

I really like Paymo so far, but I'd like to see a quicker way to add time to tasks. Instead of having to add time with the time tracker, when I'm viewing a project and my task lists, I'd like there to be times that show up on hover, to the right of the task (next to the current amount of time spent), much like how the delete/edit/close icons appear.

I think it would be useful to have +15 min, +30 min, +1hr buttons show up so I can quickly add that amount of time to a task instead of having to pop up the time tracker.

Thanks.