Option to disable spell checking
Currently, spell checking is always enabled and cannot be disabled.
To some users, the red underlining is visually distracting. Also, the spell checker is currently unable to detect on-the-fly, in-sentence language switching, which is sometimes used in mixed-language teams or when discussing mixed-language subjects (like programming).
Therefore, I'd like to suggest adding an option to permanently disable spell checking - either in the configuration, or, in the input bar's context menu, where the spell check language is usually selected.
In the input bar it could look like this: