Autocheck Spelling on Styled Text

Sorry you will have to spellcheck prior to applying an effect, or use manual spell check. 

Even if an Adobe developer read your post, they are bound by disclosure to not reveal. Uservoice is the place to go.

You might want to give an example in uservoice, as to why this is important, as I never had a need for automated spell-check on effects, so migth underestimate the importance of your post. A screenshot migth show a workflow you have where this is popular and crucial to have this.

You mean this one, right?

https://helpx.adobe.com/illustrator/using/spelling-language-dictionaries.html