vscode: Add an option to always send chat messages as [Shift]+[Enter], because IME behavior

Summary

Please add an option to the Codex VS Code extension to permanently change the key used to send messages in the chat pane to always [Shift]+[Enter].

This would allow changing the current behavior where messages are sent using [Enter] (or [Shift]+[Enter] depending on the multiple lines).

Motivation

In some non-English-speaking regions like Japanese-speaking areas, users routinely employ IME (Input Method Editor) functions for text input. Due to conflicts with the [Enter] key used in the IME's pre-editing buffer, users frequently make the mistake of accidentally sending messages they are typing to Codex.

To input correctly, users must constantly be aware of whether Codex sends messages with [Enter] or [Shift]+[Enter], while also considering whether to supplement with [Shift] to avoid [Enter] mistypes. This is extremely painful.

If Codex always sent messages with [Shift]+[Enter], this difficult typing game could be avoided. This would also prevent the problem of accidentally sending messages and consuming tokens.

Some users might prefer combinations like [Ctrl]+[Enter] or [Alt]+[Enter] instead of [Shift]+[Enter]. If that were an option, it would be an even better improvement.

Proposed Behavior

• We can switch settings to always use [Shift]+[Enter] when sending messages to Codex.
• Optional: It would be even better if other key combinations, such as [Ctrl]+[Enter], could be specified.

Refer

First post: https://github.com/openai/codex/discussions/3024#discussioncomment-15645827

Alternatives Considered

There is a way to change the IME settings and assign something else to the [Enter] key. However, since I already use the IME daily, changing this is extremely difficult. Moreover, if I change the IME settings, I then have to consider compatibility with each individual application. While this might be possible for many applications, just thinking about it is exhausting.

Additional information

_No response_