I don't suggest you to unlock a deposit bonus as it usually blocks you from wagering until you reach a certain amount of wagering amount.
I think you should just play normal as it is pretty hard to gain enough wager so you can withdraw without forfeiting your bonus.
Not with us. The bonus balance is completely separated from your player account. You can withdraw at any time from your player account without affecting the availability or balance of your bonus account. We offer what a couple of forum users called "a real bonus".