appointment with regular time

[feeder]

Hi,

I am using Zimbra in our comapny. It´s very nice and exactly what i was looking for.

But we have only to kind of appointments.
09:00 - 12:00 am
02:00 - 05:00 pm

is it possible to integrate just 2 buttons next to the normal time dropdown fields which set the time to one of the values mentioned above?

would be very helpful for me.

thanks a lot