Basically the idea for the All Difficulties on Mission League (ADM) is to play 1 mission, beating all 3 difficulties in succession, in 1 try. I'll start us off with:
MBR All Difficulties 4:43* (129/138/136) - 227 points (81/62/84)
You could also add up what they would be worth on the PDE rankings and post that too.
EDIT: Would just AD be better for the topic name (All Difficulties) and for when making posts? Just post like "Defection AD y:yy", the y's being your combined total time. You could also just post the splits if you don't know/don't care to add up the times for each difficulty. I had in mind with this to play Agent first, Special/Secret Agent next, and Pefect/00 Agent last to put more pressure on the toughest difficulty. Obviously it is a good idea to get a decent Agent time to make it worth playing the other 2 difficulties etc.