I have something to add to the mods. In the Aircraft.cfg you need to find the [GPWS] section. The top is the original, the lower is the modified value. This will remove the "GLIDE SLOPE" or "PULL UP" warning (I forget which one it is now) when on approach.

[GPWS]
max_warning_height         =  1200
sink_rate_fpm              = -1500
excessive_sink_rate_fpm    = -2000
climbout_sink_rate_fpm     = -100
flap_and_gear_sink_rate_fpm= -100

[GPWS]
max_warning_height         =  1200
sink_rate_fpm              = -1500
excessive_sink_rate_fpm    = -2000
climbout_sink_rate_fpm     = -1000
flap_and_gear_sink_rate_fpm= -1000