Any hot-keys, controllers, or foot pedals you use with Express Scribe will still function while Scribe Mini is in use.
You can switch to Scribe Mini by going to the menu View->Show Express Scribe Mini Control, or by pressing Ctrl+M.
To revert Express Scribe back to its original size, click the 'Show/Hide Scribe Mini Control Window' button to the right of the play controls. Toggle back and forth between the screen views with the keyboard shortcut Ctrl+M.