The Find and Replace dialog has two annoyances :
1. "Look in:" should indicate "Selection" whenever the dialog is open and there is text selected in the query window. Particularly important for replace actions !
2. When switching to either the "Find what:" or "Replace with:" edit field, the content should be selected instead of placing the cursor at the end. This way, what the user types reaplces the content of the edit box.

Thanks for voting :)