Effect of specifying Load Case type

Dear Sirs,

      When creating the primary load cases in STAAD, we are allowed to specify load case type as DL, LL, LL (reducable), LL (roof), WL, etc. If I understand correctly, this is used for the load combination generation. Is there any other effect for this load type definition? For example, some codes allow increase in permissible stresses for load combinations involving lateral loads, but I dont think STAAD automatically considers it even if load type is defined.

Thanks in advance

Arunkumar