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Brass rod flows fine in my very limited experience, just heat the lugs up enough to draw it through. I did the dave yates framebuilding course and I'm pretty sure I used brass for the BB shell (the rest of it was fillet brazed).
Edit: Mind you it was a few years ago and a lot has happened since then, so I could be mistaken.
Tonts-
Plus you will have been using oxy-fuel. I think the question was is MAPP enough for brass, which it isn't. The key with lugs is getting a relatively large area up to a consistent heat quickly enough to not sequester the flux before the silver has flowed. Ceeway sells practice lugs and tubes. I'd suggest buying a load and practicing with whatever gas you are going to use.
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Googling MAPP gas and framebuilding just took be down a rabbit-warren of links and gets me wondering about a few things I could get done myself. If I understand well you'd use silver rod for lugged frames and it from reading it seems it's hard/impossible to get brass to flow. Would you use brass at all? perhaps in a fillet brazed frame, possibly finished with silver? or does it need to flow between the tubes there too?
Do we need a Framebuilding 'Ask any (stupid) question' thread?