Yes, I remember that doombuilder has a replace and find utility, it can search for tag numbers, line specials, textures for flats and linedefs and even specific objects and IIRC thing flags (difficulty, class selections, etc.), it's handy for this kind of things and I remember to have used it myself too <!-- s:) --><img src="{SMILIES_PATH}/orc2.gif" alt=":)" title="Smile" /><!-- s:) -->.