Importing a point cloud for generation of DSM or DTM for orthomosaic workflows would allow a significant reduction in processing time. If the point cloud is LiDAR based, the DSM would also improve DSM based orthorectification in vegetated areas. Currently the 2.5D workflow takes a significant amount of time as the reference model is generated before a DSM and orthomosaic are produced.
There is such option so seems it is alreade available.
Processing settings->Photos used for geometry
This advanced option allows you to choose the input data used for reconstructing geometry.
None: geometry will use only point clouds (available only if input block has point clouds).