a slightly more smart mount and udev using /bin/udevd. If you have systemd-udevd, link it there instead of changing the script

init.d/mount

@@ -3,7 +3,10 @@
 depends miscfs
 
 service_type='oneshot'
-service_command='/bin/mount'
-service_args='-a'
+
+start() {
+	[[ -w / ]] || { mount -o remount,rw /; }
+	mount -a
+}
 
 unset stop

init.d/udev

@@ -1,6 +1,6 @@
 #!/usr/bin/env watchman
 
-service_command='/usr/lib/systemd/systemd-udevd'
+service_command='/bin/udevd'
 service_args='--resolve-names=never'
 
 cfg_udev_settle_timeout="${cfg_udev_settle_timeout:-60}"