Nightfire, I don’t know the answer to your 777 auto-brake question, but I would like to understand the system better. I have found that in aviation, knowledge is a priceless commodity.
In some aircraft types a time delay is used with low auto-brake settings to maximise the effect of reverse at high speed by giving it priority.
If applicable to the 777, it might be important information when landing without reverse thrust or on a normal length runway which, due to runway conditions, becomes limiting i.e. ‘short’. As such this knowledge would be a vital component of judgement, adding to the process of experience.
Ref / info:
FSF ALAR Tool Kit Briefing Notes Chap 8.4. Braking Devices.
For those who believe that they do not need to know this type of information, then consider that all of your experience might only be as good as the way in which you use it.