No expert, just an A319/320 driver with an Aero-Eng Degree, but I'd guess that since LAF not on A319 with same wing as A320, it probably isn't structurally worth it at the lower certificated weights. Ergo, if the same applies to super-mini-baby A318, don't expect it to be an availble option. Sorry, for a moment there I erred dangerously into the application of logic to Airbus design - would anyone like to correct me??
