tmp isn't just a directory off of root. It is a seperate filesystem that mounts itself at /tmp.
Using df you will see that /dev/fs1p0 is /tmp
# df
/dev/fs1p0 8064 38 8025 1% /tmp
/dev/fs1 8192 8192 0 100%
/dev/fs0 512 512 0 100% /dev/fs0p2
/dev/fs0p1 30976 24693 6282 80% /
/dev/fs0 1024 1024 0 100% /dev/fs0p0
/dev/fs0 32768 32768 0 100%
Since the filesystem is rewritten at boot, I don't think you can doo much with the /tmp directory, but since it is a seperate filesystem other than / (root) you don't really need to worry about the files that are in it since it isn't taking up your usable space.
The sound files are kept in another place off of root (maybe /kojak/snd) and copied to the /tmp/snd directory at boot. Maybe this /kojak/snd directory off of root could be mirrored and linked to on a share. I don't really remember where the snd directory is but i think it was in /kojak/snd, I deleted it and removed bleep from my Audrey.
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