Larry,
Your idea (forced march) is well-taken but, if one is playing the standard 20-minute scenario, forced march is the standard pace. All units, every turn, are marching at a pace faster than AP Hill's forced march to Antietam or the VI Corps forced march to Gettysburg. I did a study on Civil War marching speeds a number of years ago. The PDF is stored at the ACW Engineering site (
http://acwgc-engineering.com/) if interested. The marching speed in :20 scenarios is too fast, but is perfect for :30 ones.
And good luck getting any significant changes made to the game engine...
Thanks Robert, I'm going to take a look at the PDT changes listed there and the studies there. Thanks for the info. I always like adding extra historical accuracy if possible, grognard that I am.