find in current folder/group

I would like a find feature for the current folder, not just for all of my groups, etc.
maybe have a drop down arrow from the find widget (like in mozilla thunderbird where you can find by subject, by entire message...)

This would filter out and leave just the relevant files. some folders have a lot of files!
it's also faster if you have several groups. instead of building metadata and searching them all, you can quickly find what you need.

if I'm using 'find' in a group, it should also return results from the subfolders.

Thanks! :-)