[Andrew]

While you could have multiple people sync via WebDAV and our locking should prevent actual data corruption, data conflicts can still happen. Multiple simultaneous users will dramatically increase your odds of having conflicting changes on different clients. (In which case the last one modified "wins", generally on an item basis. That is, if person A changes the title of a task and then person B changes the due date of that task and then they sync up, the title change is going to be discarded because the change with the due date is more recent. Doing finer-granularity merging is something we will be exploring, but it will be difficult to do without significantly slowing the sync process.)

So basically, I don't recommend it. And I'm afraid I don't see a solution for your situation coming very quickly - that's simply not one of the current priorities.