As far as I can tell, it's impossible to set costs on external routes injected into a OSPF network by a ASBR. All external routes of a given type that are redistributed (connected, static, other ospf, bgp, rip) are only able to have a global cost set on an ospf instance level. In addition, I can't find any way to use a /routing filter to rewrite the ospf cost on egress from the router of matching network prefixes.

Is the above correct, or is there a way to have a router redistribute arbitrary routes (say, redistributing static) where one route will be redistributed with cost 10 and one will be redistributed with cost 50?

Edit: to clarify, I'm looking for something along the lines of:
Where all connected subnets are redistributed at a cost of 10 except 192.168.100.0/24, which is redistributed with a cost of 50.

In current routing filter implementation route costs can't be changed.

+1

Is this planned to be corrected in future RouterOS releases?

Christian