Tomcat Manager HTTP - deploy update

[Roberto Fonti]

Hi there.
My question is about Tomcat Manager HTTP interface.
I would like to deploy my application to the running Tomcat in the 
production environment using the Cargo Mavan plugin or the Tomcat 
Deployer. They work just fine, but Tomcat is in Amazon EC2 and the 
network connection is kind of slow: the Undeploy / Deploy takes 1 minute 
and 30 seconds in which the application is not reachable.
I also tried Deploy with update=true, but anyways, it undeploys the 
application before starting the upload of the new one. Correct?

I just would like the upload to happen in a temporary directory and, 
once the application is there, the undeploy/deploy starts. This would 
have only a few seconds of downtime. Is that possible? What would you 
recommend?

Thanks,
Roberto