Hiya!
Have you tried dragging the imported transactions over their counterparts on the right side? The ones that aren’t automatically matched will be white, but you can match them yourself and even add them to the correct bucket automatically if they’re truly new.
When you connect them manually you can choose which information to keep in your record; the data you entered or the values that were imported.
Also, here’s where you can make a suggestion for your more specific request: Suggestion Link
Hope that helps!