Ability to search files

It's be neat to be able to search files, using something like fzf. Could be configured in fallback.json with syntax like

{
    "name": "Search",
    "alias": "s",
    "type": "search_launcher",
    "args": {
        "flags": "-e -i",
    },
    "priority": 1
},

I saw the feature/efficient-search branch but wasn't sure if this is the aim or within the scope of that branch.