To do this I edited
as root with my favourite editor. I added the following line at the end:
tmpfs /tmp tmpfs defaults,noatime 0 0 tmpfs /var/tmp tmpfs defaults,noatime 0 0
You can reboot at this point and you’re all set. You could manually mount this but it could cause problems with your system.
UPDATE: Ubuntu and Lotus Notes for Linux don’t like mounting /tmp as nosuid and noexec.
Let me know if you do this and how it works for you.