I don't like the "off-chain" phrasing here.  Off-chain means, at least in my mind, transactions which never make it to the block chain.  Here's a possible revision:

* Allows spenders to submit transactions directly to receivers without going through the peer-to-peer network.  This can speed up payment processing and work with planned features such as child-pays-for-parent transaction fees and offline NFC or Bluetooth-based payments.