I would love the option to make the cache persistent between boots. Like bitcasa. I know that has a chance of having a corrupt cache(does not match the version on the server). If there was a way of tracking versions stored on the server meta data. That could help. I my case mounting the drive on other computers would be rare. Thus the risk is minimal. I am planing on having it mounted on a headless server shared via samba etc.
In similar fashion a good meta data stored on server could minimize the risk to having multiple mounts of the file system. Of course there are limits and additional risks as reported in the documentation.