I emailed them in August with the same request and received the following reply:
"It is correct that OAuth2 is currently not yet supported in Lansweeper. We've already received similar requests from our user base to add support for OAuth2, and as such, it was added to our customer wish list. We have tagged your ticket as a feature request to add weight to this. Features on our customer wish list get development priority based on a combination of customer demand and difficulty to implement. As such we aren't able to guarantee that this feature will be implemented or provide you with an estimated release date at this time."
I have no idea if the feature request list is public as it doesn't tally up with the LANSweeper wishlist forum?