I have generally held off on adding the ability to add custom hotkeys to launch applications to f&r, thinking that that would be better left to dedicated hotkey utilities.
But i've decided that f&r can offer something somewhat unique to this picture so i have started to add it; any suggestions are welcome.
Basically what i am planning on adding is a "HotKey" tab to the options dialog where you can specify combinations of SearchText and Hotkey.
So for example, you could say that hitting Alt+M should invoke f&r and start searching as if you typed "mp3"
You will also be able to use this to trigger aliases, so that alt+B could invoke f&r and start with the alias group of "Backups" to choose from (if you don't know what aliases are in f&r they are basically just a list of programs under a group heading, like a menu).
so in other words, hotkey support will just invoke f&r and then start the search going with some pretyped text; very simple and very flexible.