Sorry, I'm blind and must have not seen what you were actually asking for.
No, tasks can't be done either with Rainlendar nor gCalDaemon. Google Calendar does NOT have tasks, so there is nothing to sync them with. I *think* gCalDaemon is using a trick (only locally storing taks) but you'd need to read up on this.
Last Rainlendar beta only allows taks to be added for calendar that allow it , so this solves MY problem (my wife always added tasks to my google calendars instead of the local task file called tasks
), since the gCal calendars are no longer in the tasks list.
Again, sorry for not reading correctly what you asked for...