There's no reason to remove the brake you have. The one thing to watch out for is that if you get used to applying some back pressure with your feet while decelerating, and still apply the same amount of pressure to the rear brake lever that you usually would, you're more likely to lock up the rear wheel because you end up applying more deceleration than you think, and may skid unintentionally. But that's not a reason to remove it, just something to keep in mind.
But in any case, you should add a front brake. On -any- vehicle, the weight goes to the front while decelerating, and your front wheel therefore has more traction for braking than your back. The harder you decelerate, the more this is the case. You get maximum braking power at the point just before the rear wheel lifts off the ground... at which point any rear wheel braking will do absolutely nothing. No matter how good your rear brake is, and no matter how good you are at skidding, it will never be as good as a decent front brake, and that's just physics.