There is one to get around the problem:
In the 'Multi city' search, first enter the NRT-LAX leg, and set the departure time at 3 a.m. Then enter the LAX-MEM leg, departure 10 a.m. This will give you the chance to choose NW 2 (NRT-LAX) and NW 544 (LAX-MEM), with both flights leaving on the same date!
[This message has been edited by Vunder31 (edited 06-04-2001).]