diff --git a/README.asciidoc b/README.asciidoc
index 3bc4e16..d11ce84 100644
--- a/README.asciidoc
+++ b/README.asciidoc
@@ -242,6 +242,22 @@ instances.
     Runs the `uninstallmod` command followed by the `installmod`
     command
 
+`enablemod <modnum>`::
+`enablemod <modnum>=<modtype>`::
+    Enables the `arkmod_<modnum>` setting in the instance config.
+    modtype defaults to `game`.
+    Mod types:
+
+    `game`;;
+        A mod in `GameModIds`
+
+    `map`;;
+        The `MapModId` mod
+
+    `tc`;;
+    `totalconversion`;;
+        The `TotalConversionMod` mod
+
 `backup`::
     Backs up the saved world and game config files to a compressed
     tar file in the backups directory specified in the config
@@ -495,6 +511,30 @@ the global config.
     the `-StructureDestructionTag=DestroySwampSnowStructures`
     option.
 
+`arkmod_<modnum>=<modtype>`::
+    Specifies a mod that can be enabled or disabled using
+    `enablemod` and `disablemod`.  Note that mod ids specified
+    using these options are in addition to those specified directly
+    in the `ark_GameModIds` option, and override those specified in the
+    `ark_MapModId`, `serverMapMod` and `ark_TotalConversionMod`
+    options.  Options are processed in the order they are specified
+    in the instance config file, and `arkmod_*` options in the
+    common config file are not applied.
+    Mod types:
+
+    `game`;;
+        A mod to be specified in `GameModIds`
+
+    `map`;;
+        The mod to be specified in `MapModId`
+
+    `tc`;;
+    `totalconversion`;;
+        The mod to be specified in `TotalConversionMod`
+
+    `disabled`;;
+        A disabled mod
+
 Common ARK options
 ~~~~~~~~~~~~~~~~~~
 
diff --git a/tools/arkmanager b/tools/arkmanager
index 7b709d3..281333d 100755
--- a/tools/arkmanager
+++ b/tools/arkmanager
@@ -658,8 +658,32 @@ doRun() {
   
   echo "$$" >"${arkserverroot}/${arkmanagerpidfile}"
 
+  if [ -f "${arkserverroot}/.ark-update.lock" ]; then
+    local updatepid="$(<"${arkserverroot}/.ark-update.lock")"
+    if kill -0 "$updatepid" >/dev/null 2>&1; then
+      echo "An update is currently in progress.  Start aborted"
+      return 1
+    fi
+  fi
+
   arkserveropts="$serverMap"
 
+  while read varname; do
+    val="${!varname}"
+    modid="${varname#arkmod_}"
+    case "$val" in
+      game*|enabled)
+        ark_GameModIds="${ark_GameModIds}${ark_GameModIds:+,}${modid}"
+        ;;
+      map*)
+        serverMapModId="${modid}"
+        ;;
+      tc|total*)
+        ark_TotalConversionMod="${modid}"
+        ;;
+    esac
+  done < <(sed -n 's/^\(arkmod_[^= ]*\)=.*/\1/p' <"$configfile")
+
   if [ -n "$serverMapModId" ]; then
     serverMap="$(perl -e '
       my $data;
@@ -844,6 +868,15 @@ doRun() {
 # start function
 #
 doStart() {
+  if [ -f "${arkserverroot}/.ark-update.lock" ]; then
+    local updatepid="$(<"${arkserverroot}/.ark-update.lock")"
+    if kill -0 "$updatepid" >/dev/null 2>&1; then
+      touch "${arkserverroot}/.startAfterUpdate"
+      echo "An update is currently in progress.  Start aborted"
+      return 1
+    fi
+  fi
+
   if isTheServerRunning; then
     echo "The server is already running"
   else
@@ -886,6 +919,8 @@ doStartAll(){
 # stop the ARK server
 #
 doStop() {
+  rm -f "${arkserverroot}/.startAfterUpdate"
+
   if isTheServerRunning; then
     local stopreason="$1"
     local dowarn=
@@ -1469,7 +1504,9 @@ doUpdate() {
     fi
 
     # we restart the server only if it was started before the update
-    if [ $serverWasAlive -eq 1 ]; then
+    if [ $serverWasAlive -eq 1 ] || [ -f "${arkserverroot}/.startAfterUpdate" ]; then
+      rm -f "${arkserverroot}/.startAfterUpdate"
+      rm -f "${arkserverroot}/.ark-update.lock"
       doStart --noautoupdate
     fi
   else
@@ -1488,6 +1525,11 @@ getModIds(){
     echo "${serverMapModId}"
     echo "${ark_TotalConversionMod}"
     echo "${ark_GameModIds}" | tr ',' '\n'
+    for v in "${!arkmod_@}"; do
+      if [ "${!v}" != "disabled" ]; then
+        echo "${v#arkmod_}"
+      fi
+    done
     find "${arkserverroot}/ShooterGame/Content/Mods" -maxdepth 1 -type d -printf "%P\n"
   ) | sort | uniq | grep '^[1-9][0-9]*$'
 }
@@ -1822,6 +1864,37 @@ doUninstallMod(){
   fi
 }
 
+#
+# Enables a mod in the config
+#
+doEnableMod(){
+  local modid="${1%=*}"
+  local modtype="${1#*=}"
+  if [ "$modtype" = "$1" ]; then
+    modtype=game
+  fi
+  local modvar="arkmod_${modid}"
+  if [ -n "${!modvar}" ]; then
+    sed -i "s|^\(${modvar}\)=[^ ]*|\1=${modtype}|" "$configfile"
+  else
+    echo "${modvar}=${modtype}" >>"$configfile"
+  fi
+}
+
+#
+# Disable a mod in the config
+#
+doDisableMod(){
+  local modid="$1"
+  local modvar="arkmod_$modid"
+  if [ "$ark_GameModIds" = *"$modid"* ]; then
+    sed -i "s|^\(ark_GameModIds=\(\|[\"']\)\(\|[^\"' ]*,\)\)${modid},*|\1|" "$configfile"
+  fi
+  if [ -n "$modvar" ]; then
+    sed -i "s|^\(arkmod_${modid}\)=[^ ]*|\1=disabled|" "$configfile"
+  fi
+}
+
 #
 # Removes mod from steamcmd workshop directory
 #
@@ -2485,6 +2558,12 @@ main(){
         installmod)
           doInstallMod "${args[@]}"
         ;;
+        enablemod)
+          doEnableMod "${args[@]}"
+        ;;
+        disablemod)
+          doDisableMod "${args[@]}"
+        ;;
         installmods)
           doInstallAllMods
         ;;