expand keymap / small improvements

.Xmodmap

@@ -1,4 +1,15 @@
-keycode 71 =
+! unmap NUMLOCK
-keycode 77 =
+!keycode 77 = NoSymbol
+!keycode 77 = Num_Lock
+keycode 77 = NoSymbol NoSymbol Num_Lock
+
+! RCTL
 keycode 105 = Multi_key
-keycode 108 = ISO_Level3_Shift
+
+! CAPSLOCK
+keycode 66 = NoSymbol
+!keycode 66 = Multi_key
+
+! RALT
+keycode 108 = ISO_Level3_Shift NoSymbol ISO_Level3_Shift
+! add mod5 = ISO_Level3_Shift