Litecoin: choose where the coins come from when sending them

[crazydownloaded]

Hello,

For various (privacy/keeping relations between my addresses unknown/etc/) reasons, I'd like to send (Litecoin) coins and choosing from which of my addresses the coins come from.
For example, it's VERY easy to do using Blockchain's online wallet for Bitcoins.

I don't know how this is possible using the "official" Litecoin client and all online LTC wallets seems to be down (since I can't choose which address sends the coins, I'd need to import my "wallet.dat" to the online wallet).

Any tip to share? Do you know any alternate Litecoin client (like Armory for BTC)?

Thanks.