I don't think INGESTION would be an issue, but a leak somewhere in the pylon area that throws fuel onto some hot parts could cause a problem, I suppose. Of course, this is what managed NOT to happen to Air Transat...
I assume you're referring to fuel dUmping, not dAmping. I suppose you could descend, throw out some flaps, drop the gear. All that would increase fuel burn. I don't see why that's an issue, though, an overweight landing in an A320 is a relatively minor thing. The procedure is detailed in the QRH.