It would be helpful to be able to design a single span beam where you can dictate partial or full length uniform loading as well as point loads.
Yes. This is what the Multi-Loaded Multi-Span beam design module is for. Here is a video.
You can do that under the Trapezoidal Loads section. But in your case, you left and right loads will be the same. then, just define the start and end points, and the load will be uniform across that length.