Yes, there was a "Visual Specials" plugin for older version, where you are able to edit bb_specials.php through interface, CHMODing this file as 0777. It is absolutely no problem to rewrite these settings, so they are kept in database. BUT IT IS ADDITIONAL DATABASE REQUEST! Or even requests. As you might see, the most common options are ALL saved by hand - that gives a programmer a chance to work less, that's right, but this is the way these settings are OPTIMIZED FOR LOADING. They are loading VERY often - they loads each time when any forum's page loads, so they should be loaded FAST.
If you know PHP on a medium level, it is still very possble to use database request and load these arrays from database. That is what we call [n]non-core-destructive solution[/b]. bb_specials.php is your settings file - and could be edited ON YOUR WISH. Plus you may write additional interface to it, and share it on minibb.com :-)
On another hand - if you are not a programmer, but want this - we are offering paid support for any custom work, related on miniBB, and could develop it for just sponsored price.