tis, tis, betrayers of Unix tradition.
I use OpenBSD, I know, "There's no place like home".
Anyway, nvi stores open files as Berkeley db files in /var/tmp, say you're writing a document and the server crashes.. open reboot the files in /tmp are gone, /var/tmp on the other hand remains.
I can't say how wise it is to make the two places one, but, I'm sure you two know what you're doing. (
Still, I'd hate to be a user reading hier(7) on your system falling victim to your non-standard /tmp behaviour. ).