Hi,
you can create a utility (sling servlet) which will list all the replication agents from /etc/replication/agents.author/ , servlet will be creating a list along with checkbox where you can select all(by clicking select all checkbox) or individual replication agent and based on selection you can delete enabled property from replication agent's jcr:content node or create enable property in order to enable replication agent.
Example if enabled property with true value is present at /etc/replication/agents.author/publish/jcr:content , then only this replication agent will be enabled.
JCR node for replication agent if agent is enabled

JCR node for replication agent when agent is not enabled

Arun Patidar

