Option to automatically create swap space when creating droplet?

If you are creating a droplet using the digitalocean docker-machine driver, put this unit in your cloud-config file (the one you provide to the --digitalocean-userdata parameter)

  units:
    - name: runcmd.service
      command: start
      content: |
        [Unit]
        Description=Enable swap

        [Service]
        Type=oneshot
        ExecStart=/bin/sh -c "\
          sudo fallocate -l 4G /swapfile && \
          sudo chmod 600 /swapfile && \
          sudo mkswap /swapfile && \
          sudo swapon /swapfile && \
          sudo echo "/swapfile   none    swap    sw    0   0" | sudo tee --append /etc/fstab"

We do have this feature on some one-click applications (where a swap file is automatically created on smaller droplets) and some distributions like FreeBSD include a swap partition by default. You can add a swap file at creation by using the following script in user-data on the create page:

#!/bin/bash
 sudo fallocate -l 1G /swapfile;
 chmod 600 /swapfile;
 mkswap /swapfile;
 swapon /swapfile;
echo "/swapfile   none    swap    sw    0   0" >> /etc/fstab;

This will create a 1GB swap file as soon as your droplet boots for the first time and add it to your fstab to be automatically used on each subsequent boot.