Can you add option to triggers and perhaps somewhere else to show something not only for spec but what branch of hero talents you took? For instance i have WA for stats but they are diff depending what hero spec i chose.

There is already a hero talent option, you need to select class/spec for it.

Or you can use the spell know option for that.

I can see now that Load section has hero talent selection . Would it be possible to add something (maybe hero talent tree) into trigger section like that since it stops at spec?

There also is a trigger.