P: Make curves bigger
It would be great if the curves panel in Lightroom was physically bigger. The current panel is too small. While it's easy to make big adjustments, fine tuning is difficult and imprecise. I've attached two screenshots showing the curves panel for Lightroom (LR 4 beta) and Aperture (3.2.2) for the same image. In Lightroom, I've selected a medium contrast curve; in Aperture, I've used the "auto" curve option. Physically, the Lightroom curve panel itself measures 160 pixels per side. The Aperture one is 260 pixels per side, 60% bigger linearly, and three times the area! (67,500 pixels versus 25,600.)Aperture's bigger curves panel gives three big advantages:-- it's easier to see the changes, particularly in relation to the linear slope;-- it's easier to make changes, particularly precise ones; and-- it's easier to either select a current point or make a new one without accidentally doing the opposite.I'd also say a bigger panel encourages you to use it: just grab a point and yank it, without worrying that you have to be pixel precise. 
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