"Are there any circumstances in which a commercial aircraft in normal operations would accept a runway with a gusting tailwind?"
Indeed there are. I was at an airfield with ILS and only circle. The circling MDA was high. This had been attempted and at MDA was still IMC. The ILS wind was tail 13G25kts: very long rwy with 15kts allowance. Can you legally land? It seemed a simple question to my Flt Ops, but after many years still no reply, hence my search for opinions or facts.