I have long thin fingers, and have been reading about people desiring (and sometimes even getting) wider necks. I found these comments (by Janet Deering) interesting:
I talked with Greg (Deering) about the neck width and he has huge hands with large fingers and he said he has no problem playing with the neck size at 1 1/4". He said that some guitars he has played are not as wide as 1 3/8".Greg pointed out that the problem many people experience with a neck like ours feeling too slender at the nut is a matter of their playing technique. It is often caused by letting the neck rest in their hand instead of placing their thumb in the center of the back of the neck when they are fingering the fretboard. The problem can be alleviated with different hand technique. This hand technique allows a player much greater flexibility all over the neck, and this is why Jens Kruger originally recommended a V shaped neck, so the thumb can ride along the center of the back of the neck, freeing up your fingers to reach over and note the strings properly to create a clear note on every fret.
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