While it's nice to hear that somone uses the stairs or the cellar trapdoor, the sound (closing door) dosn't make really sense for them.
Maybe use a different sound which less tendency to break suspension of disbelief?
For stairs it could be done easily by using the normal walking sound but with adjust the pitch for each of the 2-3 steps 'while on the stairs' a bit to hint someone going up or down (based on the 'normal' pitch when walking the floor). Would enrich buildings a lot, imho.