Command-Tab displays app list to switch between them, well nice feature. But can I customise this keyboard combination to use a single key to accomplish application switching?
I can only think of a way to do it with a single key if you enable the function keys to work without holding down fn.
Then you can assign one of the function keys (F1, F2 etc.) to "Move focus to next window".
First enable "Use all F1, F2, etc. keys as standard function keys like this:
Then assign the "Move focus to next window" to one of the function keys like this:
You may or may not like Witch: http://manytricks.com/witch/