Actually, there are a good number of multis that have flat torque curves. Ever seen the one from a Speed Triple? Tuning, not cylinder configuration (or grouping), determines the power distribution.....

 

Actually....and I may be incorrect in this....but I believe torque values have more to do with valve size, cams, and stroke, don't they?

 

All of the above, plus cam timing, port shape, ignition timing curve, fueling,....

Many, many variables interacting together. The only effect that cylinder configuration can have is in terms of its effect on scavenging, for example (hence the multitide of balance chambers and the like one finds on exhaust systems, for example)....

To automatically assume a V engine is "torquier" (in the true sense of the word, as in actual torque product, not seat-of-the-pants feeeling) than an inline is ill-founded nonsense.....