There are swings and roundabouts when it comes to leverage from long cranks. While you may gain a fraction in leverage with slightly longer cranks you lose out when you come to top dead centre because its harder to get your leg through that position. Shorter cranks means your in a stronger position to start the stroke so you gain there. I've got really SHORT legs and I use custom 125mm cranks. I was pleasantly surprised myself when I first climbed a hill using them in that I wasn't slower at all. I liked climbing with the short cranks. Raising the saddle will also counter and desire to lower the handlebars.

Anthony