keeping germane to the issue. I thought it worth taking a side-step, so I tootled over to the Moodle research papers, located elsewhere, in order to celebrate what is there. I don't have the time to sweep through the 58 papers, however here are a few:
always a good place to start.
On another note, conference topics might in the future, offer choice in terms of broad L&T issues OR specifics. What I am saying is if there is identification of gaps here (in this forum) or across such a research lib, so the info is in hand-so to speak, then building on those gaps can give a conference and its attendees a purpose to aid a focused effort.
I know this is done elsewhere, for example quite often it is MOOCs that can eclipse things across a specific list, but PLE does and should have a top-bill slot too, among other topics.