I don't think this is a good idea. Native Germans are not always here, and I doubt they're willing to correct every single mistake we make, because first, they're likely to not have the time for it (this is a volunteer server), and second, our sentences, even if they're wrong in the slightest, can make perfect sense. And then, if a dude with the I always want to be corrected has his message not reviewed, he would start to rant to other people for not being corrected despite his little role, etc. We should let the Germans here correct us when they find it useful or when the learner clearly asks for a correction along with his message. No need to have 100% of our sentences always corrected. Natives are't bots. Learning a language is also about personal efforts/experience, we cannot be corrected as soon as we want because it is simply not how language learning works, and how it would work in real life. It's about personal experimentation as well. Finally, being myself native helper on the French Discord, I can only think of the addition of this role and the mayhem that it would create.