i personly love the camera... and that coming from a DotA Veteran.  yes having the camera restart can be annoying sometimes.... but i find that when ever i go into battle i have to change the angle anyway to get a better scope of the field.  for example: i usualy play Rook so when i'm pushing a lane i have to possition the camera so Rook is in the back and not obscuring my view and so i can position my Hammer Smash just right.  so i really don't see the problem. 

maybe rather than removing the camera ability to move just have it an option in Gameplay for "Death Camera? On? Off?"  then everyones happy.

The T command for Center Camera on DG could use a couple of tweaks;

auto-focus could become "intelligent camera", where the camera detects another DG (either friend or foe) and adjusts automatically (roation + zoom) to encompass both, that way you can see if you partner needs help, or your enemy is charging you, etc.

Cloaked opponents would not affect camera behavior.

this could be optional or even tiered, so as to let players that prefer, to have a manual camera, a camera that focuses only on your DG (as it is now) or the proposed camera above.