i attempt to feed my snakes that are in shed along w/ my other snakes on feed night. i don't go outta my way to feed them if they are in shed and hiding. like i don't remove their hide or poke and prod them. i offer if they are out and about.
i don't have a Russian Rat but my Corn's and Milk's and King are hit and miss while in shed. sometimes they're in the mood to eat, sometimes their not. offer but don't bother them too much with it.