... i knew the rollover is something that like doing a mission impossible. But this one with 5% capped is the real definition of impossible.
Agreed.
Also, question. If I make profit playing a game that doesn't count toward the rollover, let's say roulette for example, will I be able to withdraw winnings as long as the original bonus amount (0.02 BTC) stays in my account? Or am I simply not allowed to withdraw any amount whatsoever until the bonus has been rolled over 35 times?
You can withdraw your own deposits (player money) and any winning associated with it, anytime, without rolling over. And if the winnings are from the bonus money, you can only withdraw after the 35x rollover. The system bets with player money first before spending bonus money.