FBConfig 2.0 source code now moved to github.com with many modification to use Firebird SQL 2.5 features, check it please and test.
Firebird SQL 2.5 Config tool
It is a simple tools for edit “firebid.conf” and “aliases.conf” in GUI application,
Easy Hash Unhash line (comment it) and the description for every value.

fbconfig-screenshot

Download fbconfig 2.0.2 – 32-bit
View fbconfig project on GitHub