When I worked as a Tech for an Ag Leader dealer, this type of situation came up.  A customer asked about having an application rig where the center section was ahead of the tractor but the other sections were behind the tractor.  I attempted to duplicate such a situation by using a computer program to "fake" GPS movement into a display. This allowed me to do some testing on the bench with some section valves actually cycling ON/OFF as my rig travelled around the fake field.

The setup seemed fairly obvious because the Ag Leader setup allowed one to modify both the left/right and forward/back relationships of each boom section on a setup screen.  By default the system assumed that the left/right relationship of each section just used the boom widths center points to calculate the offsets.  Again by default the system assumed that the forward/backward relationships were all the same.  These defaults would be correct for most situations. 

However, these defaults could be changed for less common setups.  For my simulated test,  I envisioned a 5 section rig where Section 3 was in front of the tractor and all other sections were behind the tractor.  There was no confusion with the left/right offsets as they were correct.  I changed the value to indicate that Section 3 was ahead of the reference point where the other sections remained behind the reference point.

The hope was that auto swath would cycle Section 3 ON/OFF properly compared to the other sections. This meant that on a new pass, auto swath should turn ON Section 3 first at the proper location and then turn ON the other sections somewhat later.  Likewise when reaching the end of a pass, Section 3 should shut OFF first followed by a delay based on distance and then shut OFF the other sections.

Although this seemed straight forward, according to my tests, it didn't work that way.  I believe the screen depiction showed the center section "ahead" of the other sections as expected.  However, all the sections cycled ON/OFF at the same time.

I believe this was corrected in one of the updates and that later the approach did work as expected.  I don't remember if any of our customers actually used the feature.  I think the original customer who considered the approach changed his mind and just went with a conventional arrangement where the center section aligned with the others behind the tractor.