There doesn't appear to be anything in the documentation that explains how to specify the nature of a non-panorama. For example, we need something that allows us to notify the software that one input PICT represents a 170-degree pan, while another one represents a 120-degree pan.
A The msnm command has a switch called -hPanRange. When you use this switch and follow it with a starting horizontal angle and an ending horizontal angle, a partial panorama is created.
You can get a list of all of the switches for any tool by entering the tool's name followed by a "-" (dash). For example, if you type msnm-<enter>, you get a list of all of the things switches for msnm.