I wanted to be able to search the files in the current project (I believe it determines this by recursively going up the directory structure until it finds .git

I wanted to be able to search the files in the current project (I believe it determines this by recursively going up the directory structure until it finds .git or some other version control directory), but have those files weighted according to how recently they'd been opened. And the MRU (most recently used) mode would count all recently opened files, not just the ones in the current project.