1. No, Tagging is always a bad idea. You can sign Hamlin in FA for cheap, and Adams sucks to try to get on the field.
2. Just not really anyone.
3. Try to just get the best players in the draft positions you are at. They might need a little work in the secondary, but if you get the top two SS in the FA market, they make good CBs.
4. Calais Campbell is a beast with no downsides. Id keep him in the 3-4 DE, or maybe try to develop him into a 4-3 Lineman and a 3-4 End and run 4 lineman on 3rd and Long as to keep him out of coverage. Other than that, Steltz, Mario Manningham, Donnie Avery are all good choices.
5. I don't know. Maybe make Roy Williams a 2 down safety. But I think he'd be ok at FS.