refmo- What do you use to interface between the computer & the 450? I have a TS-690S which is the same thing, but with 6m. The Kenwood IF-232C interface is long since discontinued.
Found schematics for building one and a company makes one for $50. The homebrew one uses opto-isolators so the radio & computer are isolated, which is very nice.
I use the microHam Interface II (it will communicate fine direct to the Kenwoods). I think they have the interface III now. Works well , just hook up the cables, configure a virtual serial port, and start using it.
I still occasionally see the IF-232C on QRZ.com, but the microHam works at least as well, and also provides a clean isolated audio interface.
Another idea for future versions of the software: implement a 'Favorite' button, so that I can mark the items I am most interested in. And then be able to filter to only show favorites. This would be an easy way to get rid of clutter in the list.