For videos generated by those other than beta testers, I'm not sure how to tell which, if any, rune is being used. I have no idea where to find cast times in the skill calculator.
That's easy enough. Runes are not in the beta, so everything you are seeing is unruned. Cast times are not indicated anywhere offline, but most weapon skills are based on weapon speed.
Youtube of wave of light: http://www.youtube.com/watch?v=Tph4IORjyh8
Youtube of Seven Sided Strike: http://www.youtube.com/watch?v=_x_YN5d6FH8
Unfortunately, we're not able to answer your questions since neither of those skills is currently available in beta.