Hello Stefano,
In the PhotoScan 0.8.5 it is possible to import yaw pitch roll data for each camera. Although in the current version these values are not used in processing yet (except the case when camera position correction relatively to the aerial vehicle is used), we plan to include them in the processing in the future versions.
Currently it is possible to review and export estimated values as well as errors (relative to source values) for all cameras from the Ground Control pane.