People where talking about /31's not being useable on Mikrotiks quite a while ago.
It is not like they are new in the internet world at all but when I was testing them even on recent software versions /31's would not work.
With IPv4 being in short supply these dating using 2 IP Addresses on a PTP link instead of using 4 ( a /30) does make sense and I would love to know if there is a time frame they will work as nearly every other people of hardware supports /31's..
Why not mikrotik?
Craig