Add shortcut links to Dialer for common callback times

A huge help would be to on the dialer interface, have one or more shortcut links for specific callback times.
For example, 'call back in 1 hr, 'call back tomorrow'
That would save 3 to 5 steps, as well as the loading time of the pop-up callback calendar.
These shortcuts exist, but only after you have brought up the callback pop-up.