I can see some tidal data and forecasts but large amounts of the world are still missing. I'm guessing you haven't
found data providers for those yet. There are some (free) tools out there to calculate tidal data.
it certainly isn't as accurate as actual measures from tidal stations, but it would help for regions without any data.
Maybe have a look at XTide. Could be another section next to "Waves", "Wind", "Meteogram" and so on.

Keep up the great work. Best forcasting tool i used so far. and with aforementioned features i'd happily pay a monthly fee.