You can do it from both places now, the refresh icon or the share sheet.I actually use that everyday since it's possible (around iOS 5 or 6 I think). Settings >General > Keyboards, disable Autocorrect and let Spelling on (My iPhone is French so I'm translating myself to "Spelling", but that's the line right under Autocorrect).
I'm still on iOS 8.4, though. Maybe you already know this and want to say it's a bug or something ?
Probably because they duplicated it in previous betas. You can request Desktop Site from the Share sheet now.