Contrast coverage is nice because you can read/study during that time, as long as the pay is reasonable ($75-100). Can be stressful if you have to check outpatient studies before the patient leaves.
Reading more studies is not very common and only makes sense if it’s within your institution, and is getting signed off by one of your institution’s attendings, so you don’t need separate malpractice.
Protocolling studies just means you say what areas to scan, what sequences to get (MRI), what contrast phases, etc. Usually the institution has approved protocols for indications, so you just match it to that. Moonlighting to protocol studies - that is unique. Normally you have to do that for free. Are there places offering this?