Describe what you would like us to do:

Include the ap-southeast-5 region for cloud and coreos image deployments in Amazon EC2.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-regions-availability-zones.html

To Enable a region

Sign in to the AWS Management Console.
In the upper right corner of the console, choose your account name or number and then choose My Account.
In the AWS Regions section, next to the name of the Region that you want to enable, choose Enable.
In the dialog box, review the informational text and choose Enable Region.
Wait until the Region is ready to use.

We would also like to get AWS public access enabled for this region. Please use the following command:
"aws ec2 disable-image-block-public-access --region ap-southeast-5"

Let's also adjust the quota to match the other regions :
"aws service-quotas request-service-quota-increase --region=ap-southeast-5 --service-code=ec2 --quota-code=L-0E3CBAB9 --desired-value 1000.00"

When do you need this to be done by? (YYYY/MM/DD)

When it is possible preferably before our next FCOS release.