BFG, I can't speak for Robert, but my own thoughts are along the psymodel lines. I think that:
Yes, a lowpass can help.
A twopass system could help a bit to better manage potential out of data space situations...
In the final 3995f version to be published in a new thread I'd like to give away the --adbr_xxxx options with the exception of --adbr_long. Please tell me if you don't agree.
Yes, I'd like to remove all the speciial options of the functional extension except for --adbr_long.