I don't know whether this possible for IMatch or no, but Dropbox recently announced Datastore API, so maybe it will be possible to create multi-user version of IMatch: https://www.dropbox.com/developers/datastore (https://www.dropbox.com/developers/datastore)
IMatch can be used by multiple users, even concurrently. An IMatch database can be shared in read-only mode over the network. See "Sharing Databases" in the IMatch help for details.