This is also a topic that comes up once in a while. We have been experimenting with a "Quality Ensurance" team in the past, but that just don't work. Inspecting the underlying code of all submitted modifications is simply not feasible and we also do not want to put too many barrieres for people to submit their work to the community.
The only way to improve the quality is to provide feedback to the coder and educate them in better ways of solving the problem. If and what a coder does with such information is up to him/her.
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