Widget form's 's filter-by-date not using "by-name"

[Jonathon -- Improov]

In widget forms, we can do <entity-and>. Is the filter-by-date attribute able to process 
"by-name"? Seems not, from the ByAndFinder.java. I see only EntityUtil.getFilterByDateExpr() called.

Should I do a quick extension for this if it is not yet implemented?
Jonathon