I had always thought that a straight in approach was permissible if the runway was in sight and a normal landing was assured, even if no straight in minimums were published.
aterpster says no, and I would think he would know.
I don't know who is quoting me, but I did not say that.
At a U.S. airport with an operating control tower you are expected to land straight-in on an approach reasonably aligned with the runway, even if that approach does NOT have straight-in minimums.
Aspen and Santa Monica (KSMO) are but two examples of many.