>>Tell me where to find it and I will vote for it.

Hmm, I went to go back and look, and found THREE!

CORE-424
GBAK should validate data during backup, not restore
http://tracker.firebirdsql.org/browse/CORE-424

CORE-1030
Switch to restore "non valid" data and constraints
http://tracker.firebirdsql.org/browse/CORE-1030

CORE-2338
More robust gbak
http://tracker.firebirdsql.org/browse/CORE-2338