Redwings, EXCELLENT boots. Got a pair over the summer for work(on the company's dime...

)
They will serve you well, though my first suggestion is to get a quality gel-insole. My personal preference is for the Dr.Scholl's athletic gel insole. It has a flexible, plastic strip at the arch which secure my foot nicely. You're preferences will probably differ, of course.
The sole is thick, but it's non-marking and actually pretty good on average surfaces.
The boots will DEFINITELY need a period of breaking in. I actually took a dead-blow hammer to mine for half an hour and they felt much better afterward. (For those who don't know, a dead-blow hammer has a plastic, rubber, or I believe sometimes rolled-leather head. Also known as a non-marring hammer.)
Let's see... modifications....
If you can, when you remove the nameplate on the heal, drill two more holes on the opposite side, and install a simple brass heal-plate that wraps around the perimeter of the heal. Even better, you could forge/machine something with like a built-in nubby spur. Not much for functionality, but would look pretty good.
A brass toe-strip would match it up nice.
For a more feminine look, you could acid-etch the plates in a design of your choosing.
I can't imagine what else could be done to the boots. Redwings are rock solid.