customizing keyboard commands

When you say Command-A->, is the > the same key as the one with the period or are you talking about a different key?

What you need to do is use two modifier keys in addition to the "A" key. If you try your keyboard shortcut you'll find that after you hit the first two keys it wants to select all the songs in iTunes (Command-A). That won't work, so try making a shortcut like Command-Shift-+. Two modifier keys and one character key.

 

For example, you want to be able to select a song in Finder, perform a keyboard shortcut, and then have that song added to iTunes and your favorites playlist? I don't think that's possible in Finder and certainly not in Firefox.

Have you tried Automator? It might do what you need, though not in quite the same form. There are some good tutorials on youtube if you've never used it before.

 

You can create a trigger to add a song to a playlist in Quicksilver, or give it a rating. I am not sure what you mean by "favourites" in iTunes, or "you control tunes". As always, if you want to do something via a keyboard shortcut, QS is the best way.