I've done it a few times with the Heavenly Empire, and the CSA, but otherwise... why? You lose 25 years that you can often work better than the start of 1861. With exception of the countries which do not exist in 1861 (Romania, etc), I don't see why you should play that scenerio.
Anyone?
edit- Should note, I'm not quite Bashing 1861, I just feel like I'm not "using it right".