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4) Speaking of the LMZx2010, the datasheet is calling for slightly different resistor values on R_FBT and _FBB. Am I just reading this wrong or was this a mistake?
I just looked through the LMZ12010 datasheet. According to eq. (4), li_gangyi's resistor choice should get us VCCIO=2.484V and VCCINT[01]=1.193V. The recommended resistor values in the table on page 2 would give us VCCIO=2.474V and VCCINT[01]=1.210V, instead. So li_gangyi's seems better to me, as it is closer to correct in both cases.
Especially for the VCCINT regulators I'd tend to stay on the positive side of the tolerance, as there will be non-neglegible voltage drops across the traces and FPGA pads. Remember that VCCINT directly affects achievable hashrate. Up to 1.26V are allowed here (1.32V absolute maximum), so I'd probably go for 1.25V for this rail if the regulator feedback comes directly from the FPGA's pads.
To take advantage of this you'll need to define the guaranteed minimum voltage in the UCF file.