I just found out yesterday that Konqueror natively supports sFTP and another protocol which I wasn't aware of named FiSH. To use either, just enter sftp://foo@example.com or fish://foo@example.com as necessary in the Konqueror URL bar to create a connection. My fledgling experience with FiSH seems to indicate that it's considerably faster than sFTP. Not sure how it compares against Scp.
Konqueror, sFTP and FiSH
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