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 Amazon
3Dconnexion CadMouse Pro Wireless
Scan
3DX-700116 CadMouse Pro Wireless by 3D Connexion
OnBuy
3Dconnexion CadMouse Pro Wireless - Mouse - ergonomic - 7 buttons - wireless - Bluetooth, 2.4 GHz - USB wireless receive