Is it possible to use Power key on the keyboard?
 

Well, another stupid windozian question. But I get used to shut down the PC using this key. Is there any way to make it work on SuSE?

Suggest you google around for guides on using these so called "extra keys". Try, for instance, setting a key as a shortcut in the applications menu: maybe the keys are already set up and just need binding to the appropriate function.