I often need to superimpose one connector line exactly on top of another. For example, connectors from two different boxes going to the same destination. The "natural" path will superimpose nicely, but if I want to drag it to a new path, I have to do it separately for each connector line and superimpose them by eye. Either of two useful facilities would overcome this. 1) the ability to specify the position coordinates for a line as part of its properties or 2) the ability to select (click and ctrl-click) two lines and then move them together.
Also need to be able to use multi-segment lines.