It would be nice with a dedicated real fix to this. The tilt-shift corrector in Max produces results which are incompatible with other software, so it is actually impossible to match this to the shift in Maxwell or modo or what have you, or indeed even real cameras. A real shift lens basically just offsets the image horizontally or vertically. There needs to be settings for film offset, either in mm or as a fraction of the film size. Simply removing the angular distortion like this is not a good method. This is a feature I would consider crucial for arch viz.