Our consultants deliver professional development services to our clients; usually in full- or half-day sessions. They use Meetings in HubSpot to schedule them. The sessions almost always start first thing in the morning. However, the consultants are often adding those meeting to their calendars in the evenings, after they've wrapped up for the day. As a consequence, they are forever scrolling back in the meeting time drop-down.
One more bit of contexts: to help in our planning and management, we've set up two different meeting "types" (one for a full-day and one for a half-day).
We would like to be able to set a default start and end time for a meeting type. So, if someone selected a meeting type of "Full Day", the default start time would be set to 8:00am and the end time to 4:00pm.