Filter babel routes on a per-neighbor or per-interface basis

Hi, is there any possibility to filter incoming babel routes on a per-neighbor or per-interface basis? As far as I can tell, the babel implementation in bird has its own route selection algorithm and only sends a single route to the bird table. This seems to make it impossible to add additional route filters (for example: adding extra penalty to specific routes received on a specific babel interface), because with regular filters only the already pre-selected route in the bird table is changed. Also, this makes it impossible to use ECMP with babel. Would it be possible to send all feasible babel routes to the bird table? Best regards, Fabian