Yes, Wowza does write to the [install-dir]/logs/ directory. Other directories under the [install-dir] also have files which may be written to, created, deleted etc by the Wowza process. When running Wowza as a
named user I'd look at locking that user down, setting file ownerships so only that named user can write and read the files. You may have to go through a few iterations to find what works for you. As you know Wowza runs as root with a default install, and as mentioned in the link you refer to the default settings are to make the installation as simple as possible.