You can rewrite the UI code so it's easier for you to work on internally, but to the user it looks and acts like it was before --- but proceed cautiously[1]. I'm not against adding features and TTD sounds extremely useful, but having in the overview page some slight contradictions and a screenshot of a dumbed-down UI with obvious WTFs like the two duplicate lines really soured the first impression for me. (Looking at it again, I now see the path in the titlebar has been cut off, despite plenty of empty space after it...)
[1] https://www.joelonsoftware.com/2000/04/06/things-you-should-...