Throwing out an idea:
It be interesting if one could use crypt on a google drive, but also share individual files (encrypted ones, by providing the key)
I see 2 impediments to this
Being able to associate a decrypted file path with the encrypted path one wants (probably solvable)
Being able to encrypt each file with an "individual key" that won't reveal one's master key.
re 2: a thought. If one encrypts the file-name as it does today with master key (with salting, presumably), then uses that encrypted file-name + master key to create per file key that can be generated at will to encrypt the file.
if we could share the file with the real name + the per key file, we could easily write a utility to enable people to fetch individual files we want to share.
note: I think if this would be doable, one would still want to run this encryption scheme by a expert to ensure it doesn't create a weakness in the overall encryption