How to quickly move macro from one layer to another?

Is there a way to easily move a macro used in one layer to another? Currently, I need do assign the new macro using the standard method, then set the old macro to ‘None’. It would be great if I could drag a macro or key to a different layer in the tabs. Also, a way to copy a key would be such a useful feature, such as “hold Alt and drag” to duplicate.

An easy way do delete a key assignment would be useful as well.