I have written a php-site, that can modify the config-file. It can change most (if not all) settings, you'll need for a server..
Try it out here: http://www.sts-lan.dk/fMOCE
The site will work best in Google Chrome..
Download the script here: http://sts-lan.dk/fMOCE/dl.php
It's all set to go - just download the 7z-file, unzip, change very few settings, and it'll work out of the box

There is a readme-file inside the 7z-file, with more install instructions..
You'll need a mysql-database, and it will be a good idea to have cUrl installed (it's not necessary)..
The config-file will be updated as soon as any change has been made..
Please write some feedback

fMOCE
fMads OpenTTD Config Editor
Cheers, fMads
[EDIT]
Version 1.1 is up

Changelog:
- No more MySQL
- Support for change of all data in config-file
- Will now change existing config-file