Alex and karst,
A few comments to add to the mix...
1. Yes my layout design uses 8 unit trains each double heading ie 2 locos per train. They spend most of their time sitting in Layover Tracks (aka Shadow Stations, Fiddle Yards, or hidden sidings). When I did euro modelling the DB locos were individually more powerful than the US locos so maybe that's why that is less 'European' in flavour.
2, With YaMoRC boosters being rated at 3 Amps, it's a different design for power distribution than American systems. Since it's viable to put in a booster wherever I would have considered using a circuit breaker (cost is comparable), I am contemplating a design where each Feedback module is directly linked to its own booster ('comically' or not:). I could only have about 3 trains per booster anyway. iTrains makes it worse since many more trains can be on the move at one time.
3. A design inefficiency would lie in the fact that not all 16 feedback inputs would be used pairing one feedback module with each booster. In fact for a reversing loop only 1 input would be used. Your feedback modules only connect to one power/booster district.?
Anyway, I hope there is enough information to make a recommendation - do I bother with circuit breakers when I would "comically" over supply my layout with boosters? Thanks Alex for making it obvious to me that my design is comically overboosted..... lol
Oldngrey