I do not see the coin control in the option in the wallet. Can you explain what you mean by doing it manually?
Wallet QT > Settings > Options > Display > "Display Coin Control Features"
Once you enable this setting, you'll make the input controls available. To manually split a block, you select it, and send a fraction of it's value to yourself. For example:
- select a 1K block as input
- make transaction value 500
- enable the "custom change address"
- enter your usual addy as both the payment recipient as well as the custom change address
This transaction will take your 1K input, and send one chunk (aka, block) of 500 coins to your address as payment, and in addition, will send another chunk (aka, block) of 500 coins to your address as "change". So, you started with 1x 1000, you end up with 2x 500. Voila, manual coin control.
Happy Staking!