1. Yes.
2. There are legitimate reasons for absentee voting, such as military service. Absentee voting should require the reason to be stated and verified. No more early voting at all. No ballot harvesting.
3. Requiring a fingerprint on each ballot would not be compatible with the concept of the secret ballot. Instead, to receive a ballot each voter should sign and fingerprint the voter list. (Signatures should be in pen, on paper. No more of the touch screens. If they want an electronic record of signatures, take a photograph.)
4. Yes.
Very simply, all military installations/venues need only to have their Election Day voting in person, and I'm sure that the outcomes can be delivered via SECURE electronic means, while retaining the paper ballots.
If you're gonna be out of town on Election Day, then be aware you cannot vote; not difficult to understand.
As far as fingerprints; unless you're wearing rubber gloves for SOME reason, your dna/fingerprints are gonna be on any ballot you touch or handle...."secret ballot" is not even in use today, with the amount of cameras in a voting location.