Make user creation a flavour, not a step.

flavours/user.flavour/install.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+
+echo "~> Changing password for root account."
+arch-chroot /mnt passwd root
+
+echo -n "~> Do you want to create an user account? (Y/n) "
+read answer
+
+if [ "$answer" == "n" ] || [ "$answer" == "N" ]; then
+	amf_return=0
+else
+	echo -n "   Name of your new user? "
+	read name
+	export username=$name
+	arch-chroot /mnt useradd -m $name
+	arch-chroot /mnt passwd $name
+	amf_return=0
+fi