HELP request

Why not for the index tab? There's no other appropriate place to put input focus. In fact if you put the I-beam there, leave the keyword index, and return to the keyword index, the insertion point is still there ... ought to be easy.

"... can bear to touch your mouse [one more time]"
Because for the index tab, there are many other options (selectable by the mouse or tabbing), not just the edit control.
Yes, but when you first go to the keyword index the input focus is nowhere. I can't think of a better (more likely to be used) place than the edit control. Its being there has no effect on the other things you might do.