I’ve posted a message on the forwarding protocols area, linked from here:
http://forum.mikrotik.com/t/feature-request-bfd-for-static-routes/119494/1
BFD support for static routes would be extremely useful. Basicly, a static route would have an attribute to use BFD to check gateway availability. It’s much better than check-gateway because it’s a standard and it will help both a Mikrotik router and a router from a different manufacturer to detect a link down event.
I think it’s simple to implement, even!