Non groupby generates all-day display with one row

If groupby is set to none, and take a look at week view. You'll see the events are displayed all in the all-day region. This is perfect for me, since I want to have a flag to display everything in all-day region when I don't care the start and end time of the event.

However i guess by design, only one row is allowed, so i have to override the qtimeflow_preprocess_calendar_week, and reset to counter
$vars['multiday_rows'] = 5;

Let me know if this is something needs to be fixed or there's something I don't understand. thank you.