Can tomcat's pagefile usage be configured? For example, if it seems to be using too much of the pagefile, can I manually tell it to use less?
No. Tomcat is configured to have a maximum 1 GB heap size. Much of this might be allocated in virtual memory (though resident size may be small). Reducing this can actually cause Tomcat to die on an OutOfMemoryError. That is why it is important to have sufficient swap to back your RAM on an LMS server.