save effect rack with midi mapping

[warper]

some of my effect racks are really complicated and midi mapped to an extern hardware controller. sometimes it needs ours to configurate it. if i save this rack and open it in a new or existing song, would be very helpfull if the midi mapped controllers would be in action as before. for me it is no solution to save the rack in the song and open this as new song, becaus i need to use my new racks in existing, older songs.