Description of the new feature/enhancement

When new key binding actions are added (eg. openNewTabDropdown in 0.4.2382.0), they're not particularly discoverable for upgrading users since they're not added to an existing settings file. It would be nice if new key binding actions were automatically added if they don't conflict with other bindings (and this behavior would probably need to be optional)

Proposed technical implementation details (optional)

Unclear, and I appreciate that this is much more difficult than it first appears since you'd really need to take into consideration what version they were on in order to determine which key binding actions are new and which were simply removed by the user.