In the docs for enableBuffer on remoting provider ( it says to set timeout on the options for a direct call to turn off buffering for a single call.

With a direct call function this can be done by passing additional parameters:

Code:, param2, callbackFunction, scope, {timeout:30000});
But when using a store with a direct proxy, how do you pass the additional options?

This is not working for me, nor anything else I've tried:
  params : {....}
  timeout : 300000