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For security reasons I do not want z-way-server, zbw_connect, mongoose and related software run as the root user. I want to have those run under their own users.

How to configure those services?

Z-Way does not need root privileges - only access to serial port (you can add it in dialup group).

zbw_connect needs no superuser too once it got user ID. It is needed only for remote access.

webif (mongoose) needs root privileges since it needs to change system parameters. You can just turn it off, since it is optional.