I use postfixadmin to maintain my userdb, and it offers the ability to have all of your modified settings from the main config file (config.inc.php) in a separate local file, which is then 'included' in the main config file...
I have found that this makes upgrades much easier, so I'd like to request that this be made a formal feature with RC...
So, something like an autoinclude for a main.local.php file (if it exists), where any settings in this file override any settings in main.inc.php...
I'd also like the ability to define *where* this local config file might reside... ie, by default look in the current directory (where main.inc.php is), then, if $local_config_dir (or whatever) is set, look there (ie, /etc/roundcube)...
Thanks for your consideration...