Reset timer on specific pages only

I have setup a sluggish multisite with many Views on a test server. As I understand it, to really take advantage of caching and improve performances I need to limit as much as possible the number of authenticated users. I was thinking to use autologout not for security reasons, but simply to encourage people to authenticate only when they really need it (postings, personal messages...). As things stands now, the timer is reset on every page visit. Would it be possible to reset it only for a configurable set of "significant" pages? Would this work in principle? E.g.: reset on...