The idle timeout of a connection is controlled at the Virtual Server Level (within the Protocol Profile). So in the case of a TCP Profile you can modify the Idle Timeout Value, but again you would be doing this for the entire Virtual Server. I do not believe that it is possible to adjust the TCP Timeout for a specific server.
If you are looking for a way to bleed off the connections then you can either disable or force offline the node within the pool.
Disable (Only persistent or active connections allowed)
Force Offline (Only active connections allowed)
Nimbostratus