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That is possible, and if you are using ester oil There may not be an issue for some time. But if you are using a PAG oil with the R134A system and there is any amount of mineral oil in the system it will cause contamination.

If your using the old R-12 hoses (non barrier) with R134a they will leak. R134a has a much smaller molecule than the R-12 and will leak right through the hose.

This is correct, The original purpose of fresh air intake is to get rid of the cigarette smoke from the cab. And from a theory and operation stand point , having outside ambient air entering the cab will put an unnecessary demand on the evaporator to efficiently remove the heat.