Why would you want to reverse a pline? The only time I've had to do that was when I used Land Desktop for creating alignments. If the pline wasn't drawn in the direction you wanted the alignment to be labeled, you'd have to reverse it using some LSP.
Just curious.
Linetypes for one. If you use a field to get the Northing/Easting, as well, I guess that would be a problem. I contemplated setting up a little LSP that would place a single MTEXT entity that would create a field assigned to read the angle of the PLINE selected (assuming surveyors units is set, but of course, we always do that for site plans) so I guess in that situation, I'd want to make sure it read as needed.
Mostly, what I actually run into, though, is textual linetypes reading the wrong direction. It's easy to rotate a LINE 180d, but a pline with multiple segments?