All search will automatically switch from smart to precise mode if you enter original language syntax such as "lemma.g:". However, it works as smart search if you do not use such syntax and yet use original language words. Note however the difference in the results and synopses between the search that uses greek and the one that uses transliterations:
This was a helpful discovery. It's logical but I had not realized the possibilities this offers.
The possibilities are also quite interesting in Bible Smart Search: