Here how you can customize the key bindings in order to switch focus between editor and integrated terminal.

I have done it editing the file "data\user-data\User\keybindings.json" and adding the settings there. Just save and test it.

My binds in my italian keyboards:

CTRL + \ 

Switch focus between Editor and Terminal
The key backslash "\" in my keyboard is under the ESC key.

ALT + \ 

Open the Terminal if it's closed

Info

For Remote SSH I remeber I have done nothing, it inherit from local

			
   ,
 {
 "key": "alt+oem_5",
 "command": "workbench.action.terminal.focus",
 "when": "editorTextFocus" 
 },
 {
 "key": "alt+oem_5",
 "command": "workbench.action.focusActiveEditorGroup",
 "when": "terminalFocus"
 },
 {
 "key": "ctrl+oem_5",
 "command": "workbench.action.terminal.toggleTerminal"
 }

- have fun -