usually there's a sweet spot level wise where the room sound adds to the snare nicely but doesn't take away from the rest of the kit. especially if you're working with a mono room too much volume on that will cause the cymbals to loose definition.
if i can't seem to get to that sweet spot, an expander sidechained to the snare works just fine, just don't make it too obvious. it's like automating the room sound up for every snare hit