overspeed_min_speech_repeat_delay=-1
These changes do not disable anything, the pongo code does not allow this, only disables the recording
overspeed_spoken_type=none

plugin.ini
[speedcam_category:0]
;warn_distances="130:1500,90:1000,70:550,50:400,30:250" ; ~27 sec before the speedcam
say_camera_distance=1
say_camera_speed_limit=1

activated_spoken_type=speech
activated_speech="Speed camera ahead."

approach_beep_distances=200 ;0=repeat constantly "Speed camera.", 150=original
approach_beep_spoken_type=speech
approach_beep_speech="Speed camera."

overspeed_spoken_type=none

camera_in_back=0
camera_passed=1

min_frc=-1
use_road_speedlimit=1