Sorry for reviving my old thread, but this is still a major annoyance when writing forum posts and stuff...
Definately would be nice to get a fix for that!
[e] as usual i find a solution or a workaround right after posting a problem
Using chrome beta since half an hour and made several posts, cursor never jumped to first line.
Now all they have to do is improve the keyboard shortcuts on the browser and enable flash support and gestures like on ICS+. I'm so used to go back/forward with swipes i cant live without them anymore :/