[TYPO3-dev] Applying own Script or actions whith extension load (EM)

[Steffen Ritter]

Hello to all,
short question, hopefully short answer.
Is there any possibility to create Sysfolder Structure while loading an 
Extension. Or automatically import a .t3d or sth. like this, so that a 
big amount of static data is structured and does not belong to PID=0
Could there be any hook in "load Extension" where to apply own scripts?

greetings

Steffen