Comparing to stackoverflow or superuser, this site has much less questions, maybe allowing people to post their compositions here to ask for comments? Although word and many spell checkers could fix basic grammar mistakes, non-native English speakers often lack the ability to write natural English sentences because they often could choose the appropriate words and they don't know how to make some variations of the style of sentences.
It might help many people.
You may object that a composition is too long and users won't like to spend too much time on reading question. However, people who ask for help would learn to post short composition after a while after their learned that prolix questions are unlikely to be answered.
I hope I've made myself clear. Thanks!