Is it important to warm the flour before making bread?
I beleive this to have some historical base (no citation just me) as historically, storage of flour in underheated homes was in cooler areas, or in a dark/cool place such as a cellar (in quantity) and adding enough heat (via water source) is insufficient to obtain a nice even yeast growth from a starter (also cool).

I say this as my great grandmother used to move her flour and she said this gave a more even texture (less holes) while having fluffy bread as it was stored in an unheated room - which also helped protect it from insects during long storage terms - this was a LONG time ago when I was a kid so I don't remember the exact way she said it.

EDIT: Just a thought: I wonder if kneeding on a warmed surface such as a granite block would do the same thing?  Now I have a reason to install high-end counter tops? :)