Currently the distance from a star to Sol is available, but for some uses the ability to find the distance between two arbitrary stars would come in very handy. A suggestion for workflow would be, search star (highlighted on map), right-click and get option to find distance to another star, which spawn dialogue to search another star, which is then highlighted with a line between the two (as with angular distance), with the distance in parsecs shown in the same style. Reproducible: Always
A note on how to calculate this, including the apparent brightness of one when located at the other: http://www.neoprogrammics.com/distance_between_two_stars/ (needs right ascension, declination, distance and visual magnitude)
Unfortunately, no resources to work on this now.