Actually if you apply the original source material to the mix the only fleet battles in TOS were all cruiser on cruiser engagements. Fair enough that was because of budget restrictions but it is what it is.
Maybe once the initial launch is over Mongoose and ADB might consider adding a Battle Group Squadron box that would add 5 or 6 small ships (Light Cruisers, War Cruiser, Destroyers, Frigates and/ or Police Ships) to complement the Squadron Boxes. And yes the SFU has rules that would cover this in the other games.
Maybe once the initial launch is over Mongoose and ADB might consider adding a Battle Group Squadron box that would add 5 or 6 small ships (Light Cruisers, War Cruiser, Destroyers, Frigates and/ or Police Ships) to complement the Squadron Boxes. And yes the SFU has rules that would cover this in the other games.