These can be modified by 2, depending on the quality of the commander. You now have only partial control over your troops. You can see everything going on, but you cannot ensure that every unit reacts perfectly to every event. If you exercise fine control over a small number of units, you do so at the peril of ignoring the bulk of your troops. If you allow your subordinates to make their own decisions, you risk having them do foolish things.
Individual companies can keep together, but keeping a brigade together is well nigh impossible.
Mark up one stick, using a nice collection of permanent coloured inks, with all the move distances for your units. If you end up with too many marks on your stick, you may need to use different sticks for different unit types. No more rulers or tables required - simply place your stick next to the unit, and you can see exactly how far it can move. It takes a little practice to get used to using the sticks, but once you do, it's considerably faster than measuring each time. I now make up sticks even for games where I'm not creating confusion.