Letting technical writing people doing the writing won't work. A large part of the scientific writing is the discussion of the experiment, which not only helps the scientist clarify his or her own thoughts and gives insight into future experiments, but also really only is worth reading if the scientist or members of the experimental team do it themselves. Technical writers really only would have the ability to write the experimental procedure, and even then it would be hard. Since science is so specialized you'd have to have technical writers for thousands of subdisciplines, etc. This goes especially true for mathematics, where the writing procedure is very closely related to doing mathematics.
Already because of this, no time for the scientist would be saved. A Google moderation system would have two problems. First, it wouldn't save any time because you still have to have some person doing the reviewing, and secondly you have to have someone qualified doing the reviewing whom you can trust to some extent to review in confidence, for otherwise if there are certain major problems with the paper but a few good ideas, they can be "stolen" by others, which may become a problem.