[Unsolved] Hero Skills

Are there anyway i can change the skills that a hero can learn ingame? Change it while the map is running in wc3. Is it possible to add more than 5 learnable hero skills to 1 hero?

Use a Spellbook
You can find it here :
The mysteries of the Spellbook

Spell books dont show lv requirements as the hero learn skills.

It's the only way. :P
Besides you can type what spells the spellbook gives for each lvl.

are there a way to add more than 5 hero skills to a hero then?

only with a spellbook, you could ofcourse make something more complicated... a dummy ability that when used removes current spells and adds 4 new ones and then you can freeely go betwen the first four and second four

use trigger (possible..?)

ex:learn skill(element mastery)
add ability to learned hero;water ability,earth ability,fire ability,etc

like nevermore DOTA