First to note that my original intention was not pushing you to implement anything,
but my afraid I have missed something in doc. I am sorry if I have made you feeling different.
As far as I understand, Volumebooleans are limited in usable keywords
Why do you say "limited"? I think it is extremely flexible and powerful. What is missing?
Well, as academical, hypothetical and not necesserily useful example:
Imagine I need to exclude all *.ext files, created at least 2 days ago, modified today that are not fragmented.
I do know I can use repeated filebooleans for that in zone fileselects.
But I do not know how to do it in volumebooleans by listed functions,
unless I missed I can use fileboolean functions in Volumebooleans too.
By other words, what is script counterpart to /*EXCLUDE*/,
if I do not want to use CL ?