Hints can come from user conf.

rc.subr

@@ -608,11 +608,17 @@ _compute_ula_prefix()
 
 load_isp_hints()
 {
-	for _hint in $(ls ${rc_router_dir}/hints/*)
+	_hints="$( find ${rc_router_dir}/hints/ -type f )"
+	if [ -d "${rc_router_conf_dir}/hints/" ]
+	then
+		_hints="${_hints} $( find ${rc_router_conf_dir}/hints/ -type f )"
+	fi
+
+	for _hint in $(ls ${_hints})
 	do
 		v4_setup="dhcp" # v4 usually defaults to DHCP
 		_isp=$( basename ${_hint} )
-		. ${rc_router_dir}/hints/${_isp}
+		. ${_hint}
 
 		eval rc_router_v4_isp_config_${_isp}=${v4_setup}
 		eval prefix_len_${_isp}=${v6_prefix_len}