Whitelisting to bypass the reroute system.

Note, all ckeys in the ofwhitelist must be lowercase and contain no
spaces.

code/controllers/configuration.dm

@@ -81,8 +81,7 @@
 	var/forumurl = "http://baystation12.net/forums/"
 
 	var/media_base_url = "http://nanotrasen.se/media" // http://ss13.nexisonline.net/media
-	var/overflow_server_url = "byond://nanotrasen.se:6666"
-
+	var/overflow_server_url
 	var/forbid_singulo_possession = 0
 
 	//game_options.txt configs
@@ -156,6 +155,7 @@
 	var/starlight = 0	// Whether space turfs have ambient light or not
 	var/allow_holidays = 0
 	var/player_overflow_cap = 0 //number of players before the server starts rerouting
+	var/list/overflow_whitelist = list() //whitelist for overflow
 
 /datum/configuration/New()
 	var/list/L = typesof(/datum/game_mode) - /datum/game_mode
@@ -654,6 +654,19 @@
 			else
 				diary << "Unknown setting in configuration: '[name]'"
 
+/datum/configuration/proc/loadoverflowwhitelist(filename)
+	var/list/Lines = file2list(filename)
+	for(var/t in Lines)
+		if(!t)	continue
+
+		t = trim(t)
+		if (length(t) == 0)
+			continue
+		else if (copytext(t, 1, 2) == "#")
+			continue
+
+		config.overflow_whitelist += t
+
 /datum/configuration/proc/pick_mode(mode_name)
 	// I wish I didn't have to instance the game modes in order to look up
 	// their information, but it is the only way (at least that I know of).

code/modules/mob/new_player/login.dm

@@ -37,6 +37,7 @@
 
 	if(config.player_overflow_cap && config.overflow_server_url) //Overflow rerouting, if set, forces players to be moved to a different server once a player cap is reached. Less rough than a pure kick.
 		if(src.client.holder)	return //admins are immune to overflow rerouting
+		if(config.overflow_whitelist.Find(lowertext(src.ckey)))	return //Whitelisted people are immune to overflow rerouting.
 		var/tally = 0
 		for(var/client/C in clients)
 			tally++

code/world.dm

@@ -313,6 +313,7 @@ var/world_topic_spam_protect_time = world.timeofday
 	config.load("config/game_options.txt","game_options")
 	config.loadsql("config/dbconfig.txt")
 	config.loadforumsql("config/forumdbconfig.txt")
+	config.loadoverflowwhitelist("config/ofwhitelist.txt")
 	// apply some settings from config..
 
 /hook/startup/proc/loadMods()