[development] access module

Hi all, for work I am thinking on implementing an access logging module, but before I would start head on I would like to ask your opinion on the subject. Drupal core provides a logging module (the access module), which effectively logs on hook_exit. The problem I have with this approach is that this a) as far I know will get ignored for aggressive caching, b) it gets triggered for page load from any source. I thought about using a JavaScript snippet placed into the page (maybe with token so it couldn't be misused, but then a cached page is not trivial) as most bots cant run the JS. Is there any way a callback like this could be validated for a cache stored page? What do you think of the approach? Would appreciate any feedback, Balazs