It's helpful against a minor malleability issue found by Sergio Lerner, check this thread for additional information https://bitcointalk.org/index.php?topic=8392.msg1245898#msg1245898
signrawtransaction was unable to sign p2sh inputs when given a list of private keys to use. https://bitcointalk.org/index.php?topic=143221.msg7811880#msg7811880
This change allows us to dramatically reduce electrum-server RPC overhead, but breaks compatibility. If you are using script which depends on this functionality then add decoderawtransaction to get a parsed tx representation.
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