In flash fiction, every word counts and often does double duty.
Because you can use precious few words, the title becomes even more important and can be utilized to do double duty.
The title can help place the characters in their setting so less words are need in the body of the work.
Grace doest this in "Maddie's Pub" on Avenir Eclectia by letting the reader know where this story takes place even before it starts.
It can also can be used to foreshadow and add extra 'punch' to the last line or hook of the story. I did this in "Just Remember".
These are two ways to get the most out of your titles. I wouldn't mind knowing more ways if anyone has any ideas.