It would override command+A for select all.

You could rebind select if you wanted, I wouldn't really suggest doing that though. The command key sends the same key-code as the windows key, but it's not on the same place on the keyboard.

If you're on a Mac keyboard, the muscle memory should map to Option+a. Which by default types å.

If you're using a PC keyboard with your Mac, and you're not already used to it… you might want to look at 'System Preferences > Keyboard > Modifier Keys...' so that your setup either:

1. Puts the modifier keys where they are on Mac keyboards, by setting Option->Command, and Command->Option.

2. Puts most shortcuts where they are on PC keyboards, by setting Control->Command.