I don't know about keeping rats in the same room at all personally I would not as I'd worry about feeding response issues. (I know some one whom does but it is new for them so the court is still out as they say) I also have never seen any study as to what a red tail needs for nutritional requirements but there are studies as what the value of feeder mammals are,
http://www.nal.usda.gov/awic/zoo/Who...nal02May29.pdf
In case you are interested. The biggest issue would be cost you would need to feed an adult Red tail a lot (like lots) on mice it would be crazy. A friend feeds 2 adult rabbits a feeding. I'd try to switch to F/T and move your furred pets a little farther away (for you not the snake) from food feeding dead you don't get attached to snake food.