Main idea: Ambush bonus
I favor small sneaky fleets.
I can see others before they see me, and I can slip up to them pretty close.
I'd like to see a bonus of some kind if I catch them unawares.
Say a reduction in the deployment points they can use, for example.
That would let me blaze in, pick off a few, and retreat before they can muster their full forces.
A method comes to mind. Note time of initial contact, time of engagement, do math.
Very short = very chaotic.
One problem I see is abusing this as a bottleneck to deal with large fleets piecemeal.
Perhaps a timer, say five minutes, then the restriction is lifted.