Prevent certain cachingheaders sent by sessionssytem

I'm using the builtin sessionssystem in some soloutions I've made but I'm not totally satisfied with the headers sent from it. Especially I dont like the following line: Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0 The header above causes me some problems and I would like to exclude this on "some" pages. I read that its maybe possible to remove the whole line completely, but I just want to do this in certain phpfiles. Is this possible? Thankful for any input.. Eric