Yes, you need to be scanned in to try for a 1PM VQ. You do not need to be scanned in to try for a 6PM VQ, you only need to have a
MNSSHP VQ for that night.
I believe if you use rider swap that the second person riding uses the LL entrance so their wait is shorter.
Based on your questions, are you hopping to MK? If so, I think it will be almost impossible to obtain a 1 PM VQ you can use as I would not anticipate the 1 PM VQs lasting until 2 PM as they only go until 6PM when the park closes to day guests.