vilas,
If you are concerned that an aircraft, when below its gravity fuel ceiling, and with all fuel pumps off but with 3 degs of slide slip would cause an engine to flame out, then what will you do during mild turbulence?
Do you think such a sensitive fuel system would be approved?
Wouldn't you think that there would be an FCOM reference to maintain perfectly balanced flight during all turns?
As a practical real life decision making exercise, if during the IMBALANCE / FUEL L (R) WING TK LO LVL ECAM procedure I was unable to balance fuel with wings level or with one wing low, then I would consider diversion before an engine failed due fuel starvation.
However, I would not just sit there with wings level, refusing to attempt to balance fuel and repeatedly quote LIM-28 P 1/2 FCOM A to D 15 FEB 13 as in post #10.