Vesta Control Panel - Forum

I want to be able to fine tune the server according to my needs without leaving admin area, switch some options (mail server, ftp server) etc... the administration interface is very simple.
it is just intended to create web accounts... nothing more.

what do you think? I don't want to mess with configuration files, because I don't want to break anything.

It's supposed to be simple. There you get only most frequently needed options.
Adding additional settings would take a lot of time and would make panel bloated like cpanel.

Edit config files carefully and you will be ok. Plus you'll get familiar with the system and will learn something new :)