finky Very interesting question and suggestion.
The new version of ARM has just been released, so we'll have to wait a little bit to get the new roadmap for the next release. (keep a eye on the article What We're Working on for SolarWinds Access Rights Manager (Updated Jan 30th, 2019) )
However, we are going towards more Cloud/Hybrid architecture support with tools like OneDrive, Azure AD on top of the preexisting Sharepoint etc ...
What I would suggest is to create a Feature request for it and vote for it. It definitely impacts the choices made for the roadmap.
Happy New Year !