I'd like that too for FileMaker. It's one of the few Access features I really miss. I also miss the fact that I can't have more than two columns in my drop down nor can I specify a sort order based on a different field than one visible in the drop down list...
I did, however, manage to "roll my own" drop down list that accomplishes Items 1-4 on your wish list. It uses scripts and a bit of layout sleight of hand to do the job.
The demo file I am about to share a link to is written in .fp7 format but should convert to .fmp12 format if you are using FileMaker 12. You'll also see several demo "search portals" across the bottom of the same layout.
I'll download it now and try it out tomorrow.
Strange that something so 'obivious' is not included (yet). But very glad there are guys like you that "roll their own"
That's visually a nice 'roll' you made there
However it does feel backward to have to a 'search field' just to make it looks nice and work efficient.
Big debate what todo now, Next to requesting this feature.