you are correct. I tested RSS in forum, database, and glossary.
The problem with the lastaccess being updated happens with the forum. Another problem in forum RSS is that the RSS feed link doesn't show up. To get the RSS link I had to use other means of finding it.
In glossary the RSS seems to be broken. It always gives me an RSS Error, no matter how many or what user adds terms into the glossary. The xml generated on this error doesn't update the lastaccess time, but an issue it does have is that it updates the publish date/time. This will cause it to always show up as a new feed item. Since this error occurs, I can't be 100% sure it doesn't update the lastaccess if it were to get past this error.
The database RSS seems to be working as expected.