Pluto and Portlets in single WAR without shared libs?

I understand that, per the portlet spec, Pluto makes a cross-context call to 
invoke portlets, even if the portlet resides in the same web application as 
Pluto itself. Unfortunately this also requires putting several JARs in 
Tomcat's shared\lib folder.

Is there any way around this? For the project I am working on, we prefer to 
deploy our application to our customers as a single self-contained WAR file 
without depending on any shared libraries outside the application. Is it 
possible to "short-circuit" Pluto so that it doesn't make a cross-context 
call to a portlet inside the same web-app as Pluto?

Any suggestions appreciated.

Thanks,
Rob