Not exactly what you asked for, but perhaps this will help:
Like the others, I don't view the 'dropping lever' on the Walker as a problem - it's just one of the characteristics of the gun. And it can be corrected. Bending the spring has never worked for me but stoning the top of the catch on the end of the spring has worked.
Walker pros: one big mother gun, period. Big boom, lots of smoke. Recoil from essentially rifle charges is virtually non-existent - what other handgun can you shoot rifle loads with and not have to deal with heavy recoil?
Walker cons: heavy. I mean HEAVY. You could shoot big loads all day with no ill effects from recoil but your forearms and shoulders will ache from holding it up. No way to shoot 'duelist' stance (one handed) accurately. And not cheap to shoot - it eats powder like a cannon. Which it is. Also eats holsters alive. You need an expensive, heavy, strong horsehide leather holster AND belt to carry this thing around.
Dragoon pros: accurate, long distance shooter, once you get used to holding 6:00 or even lower. Handles big loads well, although can't hold as much as the Walker. Big boom, lots of smoke, and lighter than a Walker. If you have a good holster you can actually carry, and shoot, this thing most of the day.
Dragoon cons: well, it isn't really a Walker, now is it? Almost, but just not quite. Yeah, it can rattle the dentures more than an 1860 Army, but once you've touched off a full chamber Walker load, it just doesn't have the same, I don't know, oomph.