scp could be used to support copy from remote server to local using the following command:

<scp file="user:password@somehost:/home/chuck/*" todir="/home/sara"/> per http://ant.apache.org/manual/Tasks/scp.html

Users have an option to replace the loadUsingFTP task in <buildtoolkit-install-dir>jazz/buildsystem/buildtoolkit/scripts/enterprise/deploy.xml.

E.g. to replace the following task as below but other tasks like rollback, etc can be reused.
<target name="loadUsingFTP" if="isLoadMethodFTP">
<scp file="${team.deploy.common.load.ftp.calculated.userid}:${team.deploy.common.load.ftp.calculated.password}@${team.deploy.common.load.ftp.calculated.hostname}:${team.deploy.common.remotePackage.dir}" todir="${team.deploy.common.localPackage.dir}">
</scp>
</target>