Looks like the relative length of the arms is shorter, which would correct for the lack of throw in the road levers, at the cost of some stopping power. But I don't know that there is any way around that short of something like the Pedersens that boost actual caliper performance. They point out that the smaller brake is more compact and easier to accommodate.
The hand and the lever produce a certain amount of mechanical advantage, and it is hard to play with that number and not affect something like modulation, or adjustment off the rims. The levers are hard to mess with because they are used from two positions which sorta triangulates their form. These Vs should work pretty well, but as the Irish say "he's no better than he should be".