Allow rebinding existing app shortcuts (e.g. Toggle sidebar) and expose Quit (Ctrl+Q) in Keyboard Shortcuts

What variant of Codex are you using?

App (Windows desktop, 26.901.5280.0)

What feature would you like to see?

Context: I keep "toggle sidebar" on Ctrl+Q in every VS Code–based editor I use, because Ctrl+B is a full-hand stretch for something I press dozens of times a day. The Codex App is the only place I can't make that change.

The Keyboard Shortcuts page (Ctrl+/) already handles the easy half — assigning keys to unassigned actions like "Search chats" works fine. What's missing:

1. Rebinding actions that ship with a default. "Toggle sidebar" is locked to Ctrl+B.
2. Quit isn't in the picture at all. Ctrl+Q exits the app, but searching the shortcuts list for "quit" returns nothing — the binding lives below the visible layer, so it can't be reassigned, disabled, or conflict-checked against anything a user sets. Confirmed on 26.901.5280.0: pressing Ctrl+Q closes the app immediately, list entry or not.

These two keys collide by design, so fixing either alone doesn't unlock the use case: rebind the sidebar to Ctrl+Q and the shell may still quit first — there's no defined precedence today. Treating them together — rebindable defaults plus configurable (or disablable) native bindings — is what actually unblocks it.

Additional information

• Related: #27834 (native-menu commands honor only the first configured keybinding), #27835 ("Add another shortcut" discoverability).
• Windows 11 x64 here, daily-driving the App — glad to test any build that moves on this. The moment rebinding ships, my whole keymap migrates the same day. Ctrl+Q as a quit shortcut, meanwhile, is doing its one job a little too well.

Start from the Keyboard Shortcuts page opened with Ctrl+/ and trace how default bindings are represented and how native Ctrl+Q handling bypasses the visible list. Define the precedence between configurable shortcuts and native commands, then verify that Toggle sidebar and Quit can be rebound, disabled, and conflict-checked without the app exiting unexpectedly.