You can set up Job Confirmation defaults so that you do not have to select an option when raising a diary events. If you set up a default for job confirmations, you can always change this for each individual job if needs be, when raising the diary ebvent
To set the default, go to General > Preferences > Jobs/Invoicing Module > Job Confirmation Default
Here you can set up the defaults
This will only effect new diary events, all diary events that already exist will not change.