Last night Peter J. and I played a small Punic Wars game. Primarily it was to see how Ager Sanguinis rules could be modified for the Punic Wars. To make life interesting I set up a scenario where the Romans had to come straight off the line of march and break through the Carthaginians in hilly and wooded terrain. Deployment was 'free' and both sides deployed the bulk of their forces on the same side of the table; with the game played long ways (giving only a 6 foot wide table to begin with), and limiting terrain, this led to everything piling up in a small area of ground - a slogging match.
As for the rules - we used the AS quick play sheet and made everything else up as we went along - they worked well for a first outing. Most troops, formations and weapons have now been classified and their position in the tables decided. I've got to say that Piquet's Field of Battle by Brent Oman (on which AS is largely based) is such a strong, mechanically sound rule set that tweaks are easily made to 'stick' without unbalancing the basic mechanisms.