When drafting a new toot, pressing Ctrl+Enter should submit. Tab doesn't work on this screen, so there's no keyboard-only way to submit the toot.
A possibly relevant merge request was started @ https://invent.kde.org/network/tokodon/-/merge_requests/182
Git commit b09fc2536c003e74146c6ddad10acb6e5e6c93ab by Joshua Goins. Committed on 10/03/2023 at 19:25. Pushed by redstrate into branch 'master'. Allow submitting posts by pressing CTRL+ENTER or CTRL+RETURN M +19 -7 src/content/ui/StatusComposer/StatusComposer.qml https://invent.kde.org/network/tokodon/commit/b09fc2536c003e74146c6ddad10acb6e5e6c93ab