To control third person camera there are ConVars (unfortunately, it's client side only):
Code:
c_thirdpersonshoulderoffset 20.0
c_thirdpersonshoulderaimdist 120.0
c_thirdpersonshoulderdist 40.0
c_thirdpersonshoulderheight 5
cam_ideallag 0
cam_idealyaw -5
cam_idealdist 20
Maybe it will help you.