Added shields, and changed the BurstCount to 3.
Looking at the code, it looks like shields were an option for the cannons at one point, must have been taken out. For the shield model I used the TEC Siege Frigate Shield Mesh.
MaxShieldPoints 500.000000
ShieldPointRestoreRate 2.000000
ShieldMeshName "Shield_FrigateTechSiege"