I will admit that my interest in Scholastic metaphysics is rather broad and my number one priority right now is narrowing down towards a research question. I would say that my highest interest is in the way St. Thomas and the scholastics restated and used Artistotle's four causes and principles.
I asked my original question because I have two ways of stating my determined question, one in terms of philosophy and one in terms of history. If I were to frame my study in terms of philosophy, I would want to examine a question such as: "How can the principle of motion (for example) be defended against Humean scepticism?"
From a historical perspective, I would want to examine the question of the early modern transition away from metaphysics, essentially: "what grounds did Descartes, Spinoza, etc give for abandoning Aristotle's causes? Where they intellectual or did they stem from political/cultural/"practical" origins? Did they make any real attempt to respond to the questions posed by the Medieval Scholastics?
I came up with these examples somewhat off the cuff, but I hope they help explain where my thinking is. As for MAPSS, unfortunately your example of a serious gap was right on the money as I would probably need to know Latin but don't. I have a professor who is willing to tutor me and possibly build an intermediate independent study for me, but it is still a serious issue.