If you want full freedom of movement, you should opt for a wireless mouse such as this one. The format of this mouse is such that it suits those with smaller hands.
From Quzo
V7 MW500 Vertical Ergonomic 6-Button Wireless Optical Mouse with adjustable DPI - Black
Clove Technology
V7 MW500 Vertical Ergonomic 6-Button Wireless Optical Mouse with adjustable DPI - Black