My typing style consists almost entirely of a collection of bad habits. Far too many of them to list here.
Just as an example, though...I usually press a, s, d, z, x, c, v, and all of the left side mods (which are the only ones I use) using my thumb. Modifiers take precedence over letters for use of the thumb, so a capital A is usually done with the thumb on shift and the ring finger on the letter.