The "modify it out from under you" problem would be no worse than it is now. Right now anyone could update it in the database while you are working on it, and you won't know unless you re-fetch it. If someone modifies it in the shared cache it's the same, i.e. it won't affect the copy you're working with unless you re-fetch it from the cache (or the database). That's because what you get back from the cache is a copy, not a reference to the item in the cache.
It's possible (and already built into some modules) to use file-locking to provide exclusive access to a cache entry, but that won't really help because multiple machines are involved and the real master source is the database, not the cache.
Another angle would be node-level locks in MySQL based on the code from Apache::Session::Lock::MySQL. May not be worth the effort though.
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