It seems to take forever to type a comment in Yahoo due to the fact that the cursor (focus) gets moved out of the text box so frequently that I spend as much time on the mouse refocusing the cursor on the comment text box as I do typing a comment. RIDICULOUS!!! This text box here shows that you can have a persistent text box that works just fine.
Revamp your code to make it more user friendly. Or, if the object is to make commenting as difficult as possible, then just get rid of comments altogether.
How about it Yahoo? Am I just wasting my time here or will you actually listen to your clients?
FYI - using Chrome browser.