I would love it if Audition had a new selector tool that allowed easy selection of harmonic overtone frequencies - similar to the tool in Sony's Spectralayers software.
Basically, when you select a fundamental frequency, the tool attempts to include the overtones of that frequency in the selection. You can also select the second or third overtone and the tool will find all the overtones including the fundamental. See this vid at 14:21 for an idea of how it looks: https://youtu.be/izRUplN5EHQ?t=859
I think it would be an awesome addition to Audition.