Turn bfr-reasoning on or off in the default-hints.
Usage:
(bfr-reasoning-mode t) (defthm bfr-related-theorem-1 ...) ;; bfr reasoning is active here (defthm bfr-related-theorem-2 ...) ;; bfr reasoning is active here (bfr-reasoning-mode nil) (defthm other-theorem ...) ;; bfr reasoning is disabled here