standard metric for "forceallplayers"

stepmania/Themes/default/metrics.ini

@@ -2169,7 +2169,8 @@ NextScreen=ScreenJukebox
 PrevScreen=@ScreenTitleBranch()
 StyleIcon=0
 TimerSeconds=0
-OptionMenuFlags=together;forceallplayers
+OptionMenuFlags=together
+ForceAllPlayers=1
 LineNames=1,2,3,4
 Line1=list,Styles
 Line2=list,Groups
@@ -3656,7 +3657,8 @@ TitleX=SCREEN_CENTER_X-180
 TitleOnCommand=zoom,0.5;horizalign,left;ShadowLength,0
 TitleGainFocusCommand=diffuseshift;EffectColor1,1.3,1.3,1.3,1;EffectColor2,0.3,0.3,0.3,1
 TitleLoseFocusCommand=stopeffect
-OptionMenuFlags=together;forceallplayers;smnavigation
+OptionMenuFlags=together;smnavigation
+ForceAllPlayers=1
 
 [ScreenOptionsService]
 Class=ScreenOptionsMaster
@@ -3668,9 +3670,6 @@ PrevScreen=@ScreenTitleBranch()
 # "Together" forces the vertical cursor to move together for both
 # players.
 #
-# "ForceAllPlayers" enables all players when the screen loads.
-# This should be enabled for menus used outside of gameplay.
-#
 # "SMNavigation" forces the START button to end the screen.  This is needed
 # when using entries that change the screen; otherwise, the only way to
 # exit the screen when in regular mode is "exit".
@@ -3707,7 +3706,8 @@ TimerOnCommand=hidden,1
 StyleIcon=0
 TimerSeconds=0
 AllowOperatorMenuButton=0
-OptionMenuFlags=together;forceallplayers;smnavigation
+OptionMenuFlags=together;smnavigation
+ForceAllPlayers=1
 PrevScreen=ScreenOptionsService
 NextScreen=ScreenOptionsService
 
@@ -3718,7 +3718,6 @@ PrevScreen=ScreenOptionsService
 LineNames=1
 Line1=lua,OptionsRowTest()
 HelpText= 
-OptionMenuFlags=forceallplayers
 
 [TextBanner]
 TitleX=-90

stepmania/src/ScreenOptionsMaster.cpp

@@ -19,6 +19,7 @@
 #define LINE_NAMES					THEME->GetMetric (m_sName,"LineNames")
 #define OPTION_MENU_FLAGS			THEME->GetMetric (m_sName,"OptionMenuFlags")
 #define LINE(sLineName)				THEME->GetMetric (m_sName,ssprintf("Line%s",sLineName.c_str()))
+#define FORCE_ALL_PLAYERS			THEME->GetMetricB(m_sName,"ForceAllPlayers")
 
 
 REGISTER_SCREEN_CLASS( ScreenOptionsMaster );
@@ -35,6 +36,13 @@ void ScreenOptionsMaster::Init()
 	split( OPTION_MENU_FLAGS, ";", Flags, true );
 	InputMode im = INPUTMODE_INDIVIDUAL;
 	
+	if( FORCE_ALL_PLAYERS )
+	{
+		FOREACH_PlayerNumber( pn )
+			GAMESTATE->m_bSideIsJoined[pn] = true;
+		GAMESTATE->m_MasterPlayerNumber = PLAYER_1;
+	}
+
 	for( unsigned i = 0; i < Flags.size(); ++i )
 	{
 		CString sFlag = Flags[i];
@@ -42,12 +50,6 @@ void ScreenOptionsMaster::Init()
 
 		if( sFlag == "together" )
 			im = INPUTMODE_SHARE_CURSOR;
-		else if( sFlag == "forceallplayers" )
-		{
-			FOREACH_PlayerNumber( pn )
-				GAMESTATE->m_bSideIsJoined[pn] = true;
-			GAMESTATE->m_MasterPlayerNumber = PLAYER_1;
-		}
 		else if( sFlag == "smnavigation" )
 			SetNavigation( NAV_THREE_KEY_MENU );
 		else if( sFlag == "toggle" )