1999 Manual, Speed Controllers, and Breakers

[Venkatesh]

"Tip: An easy way to put a circuit breaker in series with an Innovation FIRST speed controllers is to install the circuit breaker in a junction block and draw +12 Vdc from the protected output tab. This method should be fine for most teams and is recommended by FIRST for simplicity and reliability. However, robots pushing the performance barrier can obtain a slightly higher continuous output current from the speed controller by placing the circuit breaker on the output side in series with the motor."

I happened to have a 1999 competetion manual around, and I was reading it. When I read this statement, I began to wonder about it. First of all, is this still legal? Second, is the gain worth the trouble?