the question seem's to have been answered, but for the bonus ones;
a) As Warhammer has stated. If I remember correctly a cure for this was not proposed in the early days & if one had been provided after manufacture, it would have been to expensive to carry out.
b) As mojodoctor points out, the Shell/Monsanto JP7 was developed to have a high flashpoint because of the high operating temperatures expected. JP7 was also substituted as hydraulic fluid for control of the burner nozzles & could be subject to temperature somewhere in the region of 400c.
c) Due to the high flashpoint of JP7, elctrical ignition was ruled out & ignition was acheived by chemical means using Tri-ethyl borane (TEB). The TEB tank was stored onboard the A-12/SR-71, as it was required for burner ignition during flight.
Point of interest - another chemical (A-50?) was introduced into the fuel on operational flights to reduce the RCS of the burner plumes.