So in short, yes the ability to unblock automatically blocked dates in synced calendars would help, but in addition we need for manually blocked dates to NOT be blocked in short synced calendars.
I use the synced calendar feature so that dates in one calendar get blocked when there is a booking in another. The problem arises when I wish to block a date to prevent guests booking particular dates in a calendar, then the same synced calendar also blocks those dates in the linked calendar which is not what I want.
Furthermore, sometimes it would be nice to permanently makes dates available periodically.
please ignore the following text:
make dates available in synced calendars when you wish for both dates to be available