Task Reminder - When Date & Time Pick List

Task Reminder - When Date & Time Pick List

Two questions. Does anyone know if:

1. there is any way to autofil the WHEN date when setting a Task reminder to equal the Task Date?

2. The Reminder selection drop down list shows time for 24 hours - is there a way to limit this list to working hours? Same for Schedule Call Start Time?

Getting sick of replicating date entries and starting time selection from 00:00!