Symptom:
(public)
Does it support differentiating papers--in our case, distinguishing papers
submitted to one of two categories?

Problem:
(public)
Solution:
(public)
Yes. You can distinguish between papers based on format, or
area, or other criteria. I assume you mean "short papers"
vs. "long papers", or "papers" vs. "posters", or something
of that sort. Yes, START supports this.