As of now, moving load feature is available only in vertical plane. But moving load in horizontal plane isn't available yet. But, as per industry demand, moving load to be applied longitudinal and transverse direction, simultaneously. Staad pro should have these features available, as soon as possible. Moreover, in case of multiple cranes runs along multiple bay of same roof, the "GENERATED LOAD" from vehicle definition" should be separated, like for crane-1 , 1-42 GENERATED LOAD TYPE 1 -2.2 1.2 XINC 0.8. for crane-2, 1-42 GENERATED LOAD TYPE 2 -2.2 1.2 XINC 0.8. for crane-3, 1-42 GENERATED LOAD TYPE 2 -2.2 1.2 XINC 0.8. for crane-4,  1-42 GENERATED LOAD TYPE 2 -2.2 1.2 XINC 0.8. So that varieties of load combinations can be created. Like crane 1 is rested and remaining 3 are moving, two cranes are working and remaining two are rested. This can be possible only with separated "LOAD GENERATIONS" which syntax shown above. With existing option, the GENERATED LOAD is comprises all types of cranes (TYPE1, TYPE2, TYPE3 etc) in a single LOAD GENERATION option, the drawback of this option is that, load combination with only selected cranes in different situations can not be created, (i.e. all cranes shown working simultaneously . This option needs to be implemented soon. Either, add multiple "vehicle definition" features to facilitate the same.