User/Mods/Admin cookies timeout

[ZiNgA BuRgA]

The "Remember Me" checkbox added in 1.6 really should be unticked by default.
(yes, I added in that feature, but whoever wrote up the list of features specifically said to tick it by default, and when I suggested otherwise, I was ignored)

Otherwise, requires a code change.  Search for a header("Set-Cookie: ...") call in member.php somewhere.
I assume you're resourceful enough to search up on the syntax of the HTTP header.  If not, Google is your friend.