Late Roman legions included a quiver of hand thrown darts kept in the hollows of their shields.
According to contemporaries, this gave the legions nearly the missile capacity of bowmen or skirmishers.
The exercise of the loaded javelins, called martiobarbuli, must not be omitted. We formerly had two legions in Illyricum, consisting of six thousand men each, which from their extraordinary dexterity and skill in the use of these weapons were distinguished by the same appellation. They supported for a long time the weight of all the wars and distinguished themselves so remarkably that the emperors Diocletian and Maximian on their accession honored them with the titles of Jovian and Herculean and preferred them before all the other legions. Every soldier carries five of these javelins in the hollow of his shield. And thus the legionary soldiers seem to supply the place of archers, for they wound both the men and horses of the enemy before they come within reach of the common missile weapons
— Vegetius, De Re Militari
Any way to represent this in DBA/M?
Perhaps give late Roman legions the ability to attack like psiloi prior to physical contact?
Well, Late Roman Legions, and the Later Auxilia, had archers in the rear ranks.
Early Legionaries = with short ranged heavy ‘pila’ = a combat factor of 5. Later Legionaries = with light javelin/spears, ‘martiobarbuli’ darts, and rear rank archers = a combat factor of 5. So it’s already been taken into account in the point blank close range close combat.
DBA is a top-down army level set of rules, not a bottom-up set of skirmish rules. And as such generals would not be bothered about whether their men were in range or not, just whether they were getting ‘stuck in’ and doing their job… …i.e. what DBA calls ‘close combat’, which includes both short range shooting and hand-to-hand fighting.