I was looking for the defender's fleet to be ignored in the simulation if they will tactically retreat.
I use this simulator primarily for raiding so its important to know how many cargos/ships i need to send but since the sim includes the defender's fleet even though they will tactically retreat, it leads me to send more ships than I need to.
Ok, I get it.
I'll think about it for one of the upcoming updates.
The problem is that it can be different for different defenders.
For example when they have admiral or disabled tactical retreat.