Can we assume that you would always want to pass the same values to both cache-to and cache-from?

Maybe it would be better to have something like:

options:
  cache-to:
    ...
  cache-from:
    ...

We could keep passing options not under cache-to/cache-from to cache-to for backward compatibility.

I think it's pretty safe to assume that.

url, url_2 & token are used for auth with the cache server, which needs to be the same for read/write.
scope is basically the key for such read/write, can't think of a good reason to use different keys.
timeout could maybe benefit from different values, but a priori seems overkill.

I might be missing something, though. Happy to apply your suggestion if you prefer.