Several alterations we use to the rules.
Good Generals have the option of a + or - 1 on the dice roll. This can prevent the disastrous 'stand unformed' (falter) result when testing to be charged, when a -1 could result in a retreat (less danaging by far for the charged unit). It can also prove decisive in the cavalry persuit test.
We also have added a +1 modifier for units testing to charge which have not been fired upon. And a -1 modifier if units which are charging are outnumbered by 100% or more.