is this also true - not only for engine, memory, fan etc - but also for pool adress - username and password? (is it saved, too? so "./cgminer" is enough?)
Mostly yes, with one very important no. It writes all your settings for engine, memory, fan, voltages, kernel, vectors, worksize, temperatures, and most pool settings. You need to go into the config and manually add your pool passwords. You can also add more than one pool into the config file, and it uses them as backup.