To add a new datastore manipulation tool such as rclone or s5cmd in addition to the s3cmd that the core supports you will need to modify or add to the following files:

adt-autoscaler-scripts/installscripts/InstallDatastoreTools.sh
adt-autoscaler-scripts/providerscripts/datastore/InitialiseDatastoreConfig.sh

adt-build-machine-scripts/builddescriptors/buildstyles.dat
adt-build-machine-scripts/initscripts/InitialiseDatastoreConfig.sh
adt-build-machine-scripts/installscripts/InstallDatastoreTools.sh
adt-build-machine-scripts/providerscripts/datastore/*

adt-database-scripts/installscripts/InstallDatastoreTools.sh
adt-database-scripts/providerscripts/datastore/*

adt-webserver-scripts/installscripts/InstallDatastoreTools.sh
adt-webserver-scripts/providerscripts/datastore/*