#2
i'm not really sure, but i think it also has something to do with fret spacing. I mean, just thinking, you can fit 24 frets with more space between on a 26" neck than a 24" neck.
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Epi Les Paul (SH-1 '59 neck, SH-11 custom custom bridge)
#3
lol we have the same avatar NICE! I'm not sure how they measure it, but i believe the biggest difference for example between 24.5 and 25.5 scale length is string tension. When tuning down the 25.5 scale guitar string tension will be better.

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Manuel Rodriguez C Cedar Top