Hi,

is it possible to change, what you have to do to level a skill up? For example: Pickpocketing rises, if you steal something. But if I want, that it rises if, for example, I just run around (perhaps xp equal to the covered distance). Is that possible?

It is and there are already multiple mods on the Nexus that exactly do what you're asking for.

Could you link one of that?

All what I saw, were heavily scripted mods, which use the SKSE and do something in an "asi"-file. How can I open this sort of file? Or: Is it possible with the CK alone?