It won't work, with base electrum.

However, this patch applied to 1.9.5 will make it work, with the exact syntax as bitcoind -- you have to supply the private key yourself however. It won't look it up from the wallet.... at least I don't think it does. I never tested it that much as this code was turned into a plugin later on.

http://pastebin.com/B7x0fTQr