That level of customization is not available. If you want a task to start, say, 30 minutes after another task and your break time is set to 15, you can still do

That level of customization is not available. If you want a task to start, say, 30 minutes after another task and your break time is set to 15, you can still do it by using the "Set start time" feature when adding/editing tasks and setting the right time for that task to start at.