Change the Media Composer Settings
Double click on the Composer Settings and change the Data Display
Go to the Keyboard settings and double click on Keyboard
Keyboard settings will open. We want to map some commands to the keyboard as well as to the Composer Window
Go to >Tools>Command Palette or click on Command 3 or Control 3 (win)
Command Palette opens
Make sure you have Button to Button Reassignment selected
Then just drag whatever button you want to any open blank key or position on the composer window.