Feature Request: Use Eval Columns in filter controls

Would it be possible to have evaluator columns selectable in e.g. any filter controls, like label assignments for (specific) folders Prefs PAGE="folderlabels" or general filtering Prefs PAGE="filters"

See, my posting with initial request here.
Reposted now, to separate the request from the above discussion.

THANKS!

The latest beta that implements that feature now!