Have Chrome autodetect language before spelling checking?

Chrome can automatically spell check emails I am writing in Gmail. I have two language installed: Dutch and English in both UK and US versions. And I type emails in both languages regularly. However, that requires me to switch the setting all the time:

Can I have Chrome automatically detect which language I am typing my email in, and automatically pick the correct language for spell checking?

This does not seem to be possible currently. See http://support.google.com/chrome/bin/answer.py?hl=en&answer=95604 at the very bottom. It suggests what you did...

You can enable the beta version of "simultaneous spellchecking in multiple languages".

go to about:flags and enable Enable Multilingual Spellchecker: