Disabling the User Inactivity Timeout is not currently possible nor should it be necessary in your case. As the NOC view (as well as any ipMonitor page that has the little flashing orange squares) auto-refreshes itself, it should keep your ipMonitor session alive. As a result, no session expiration should occur and the NOC view should stay on the screen until the end of time (in a perfect world where computer hardware lasts forever and upgrades are not necessary).
Hope this answers your question
Thanks for the quick response Chris!