How to make Launchd/LaunchAgents wait for volume mount?

I've been trying off and on for months to resolve a problem I have starting up named on my OS X 10.5 Mac Mini, which acts as a home server. Actually, I've been trying since 10.4 came out.
All my configuration files are located on a volume located on an external pair of RAIDed drives. At system startup the volume mounts automatically, and I have soft links pointed to the remote directories, in this case /usr/local/etc/. The problem is that system startup doesn't wait for this volume to come online before starting to run items in LaunchAgents. Therefore, using the StartAtLoad option, I'll see messages in the system log from bind saying that it tried to start, but the config file /usr/local/etc/named/named.conf wasn't available, so it died.
I've experimented with WatchPaths - that doesn't seem to work reliably because by the time it gets going, the path is available; since it doesn't actually check availability, but only status change, it doesn't work. (If I log in and touch the file afterwards, named starts right up.)
I can figure out some hack to run a script and check the status regularly and launch/re-launch, but I'd rather figure out how to do this the "right" way with launchd. Current (still broken) script is below. Thanks for suggestions!
KeS
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Label</key>
<string>org.bind</string>
<key>ProgramArguments</key>
<array>
<string>/usr/sbin/named</string>
<string>-f</string>
<string>-c</string>
<string>/usr/local/etc/named/named.conf</string>
</array>
<key>WatchPaths</key>
<array>
<string>/usr/local/etc/named/named.conf</string>
</array>
<key>Sockets</key>
<dict>
<key>Listeners</key>
<dict>
<key>SockServiceName</key>
<string>domain</string>
</dict>
</dict>
</dict>
</plist>

Umm, ok. Are you suggesting that there's more likelihood of getting an answer there, or that it's in the wrong place here? I hate to bother developers with a user question. I'm not asking for new features.
Tx.
KeS

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