Looks very cool. I'll mess around with it when I return from my travels.
I have a dumb question--while it's pretty easy to find room mode calculators, they identify peaks, so how do I identify and treat nulls? My big issue is with nulls (suck outs), which are virtually impossible to overcome except with traps to bring down the peaks thus reducing the relative difference.
Another question I have is how to deal with alcoves, etc. in an irregularly shaped room?