[All Versions] Line Style Properties - Any Documentation on These Settings and How They Work

There is a somewhat hidden dialog box that is part of the Line Style Editor. If one double-clicks on a Style Name in the Name list, a Line Style Properties dialog box will open. In the newsgroup, there is a thread warning to never change the System ID as this can render a linestyle unusable. However, I discovered that if a linestyle was created at an incorrect Scale, one could enter a scale factor in the field below the Units menu and it would from then on scale the linestyle by that value in addition to any other scale factors that the program applies - annotation scale, global scale factor, line style parameter scale, etc. This was something I found useful for a handful of our legacy line styles.

Interestingly, it seems a value of 1 or zero seems to accomplish the same think - no change in scale.

There are three options on the Units menu, but my experiments with the other two proved inconclusive. So, my question is this: Is there any documentation on how these can be used to develop special line styles, if at all. I had a situation where a client wanted a specific gap/dash pattern that always plotted the same, no matter what the scale. Sort of like LC=0 thru 7. But they wanted this to be used for a double line style that was "Physical" to represent Sanitary Sewers by Diameter. For example, the 24" Sanitary line would draw two lines, 2' appart, So these might look different widths depending upon the plotted scale, but the dash/gap pattern would always be sized in plotted units. The only way I was able to accomplish this was by using one of the numbered line codes and making my plot driver draw that linestyle using the clients dash/gap pattern. I wondered if the Unite: World (UOR) or Device setting would allow me to create a linestyle that plotted similar to the numbered line codes. But I was never able to come up with anything conclusive or consistent.