Well you can change the overall distance of the warning in the ini (under [warning distances]), but there is individual distances for different cameras. (might have a look at that)
I did put in a part where is doubles the warning distance if you are above 60MPH, but not sure if that is working too well, as I seem to get the warning come up early and then it disappears befre coming back up at the normal distance, will have to have another look at that.
HARDWARE: Fujitsu Stylistic ST5111w/WiFi and dock, internal Hitachi 500G HD, external 1TB HD, Sierra Wireless Aircard 550, DVD-RW, BoomzBox HD radio, XM Commander, Delorme GPS, Saitek X-52 Pro joystick, BluSoleil Bluetooth, TPMS, FB, Elm327
Should be a section so.
in the settings.ini of freedrive. The .4 is the distance in miles or kilometers, can't remember which (might actually change according yo units.)