520Bit -

Coin control is already a working feature of Peerunity.  Peerunity is the community-built wallet with several enhancements over Sunny's current reference wallet.  It was released in May and has already achieved wide-spread adoption.  To my knowledge, no significant security bugs or incompatibilities have been reported.  You can see the number of people already using Peerunity by having a look at http://cryptocities.appspot.com/peercoin-fullnodes.html.    (Peerunity is identified in the node version number.)

You can find out more about Peerunity here: http://www.peercointalk.org/index.php?topic=2902.0

Note: Coin control is currently considered an "expert" feature and must be deliberately enabled through Settings > Options > Display.  After enabling coin control, use the "Send Coins" tab to explore the individual transaction outputs stored in your wallet.