You can definitely setup a WebFilter that will add relevant headers.
Yeah, good point, but in richfaces 3.3.x there used to be a context-parameter org.ajax4jsf.DEFAULT_EXPIRE for handling those issues.
Would be great to have the same functionality back - otherwise everybody has to implement his own resource filter ...
we need to know which resources cause you troubles and from where they come from
in order to identify what is an issue and from which subsystem it comes.