If properly designed and set-up, you shouldn't have to touch the juice or air controls. Except to adjust for vaping preference and performance.
If you have leakage or flooding issues..... Shutting off juice and air flow can help reduce these issues as can a drip tip cap. Personally I prefer to set it and forget it. If you do close the juice off between vape sessions.. Get into the habit of letting the cotton (any wick) re-soak a minute or 2, before you fire.