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So yes, I'd say that becoming an ODP editor can definitely improve the speed at which the category you're interested in grows. That's a good reason to become an editor, not a bad one (as long as you're not planning to list prohibited mirrors or delete all your competitors' sites or something else that will get you swiftly booted, that is.)
Having the correct categroy eliminates the slowdown as a site shuffles from one wrong categroy to another.
Another editor, when reviewing the site in the correct category, may see the quality description standing out among the keyword loaded mis-spelled submissions, and review that site ahead of the rest.
On the other hand a new editor may get into a category, fail to mention he wants to list his own site, and stick it in ahead of the others. But since they are so inexperienced, it usually is pretty obvious, the editor gets terminated, and the site gets the dreaded Red Tag.
Of course, you could probably get the same level of familiarity with the ODP structure by spending a comparable amount of time browsing it as a user, not only by being an editor.
And, reading the editing guidelines, which are public. In most cases there is only one obvious, correct site title. As for the description, an accurate one that isn't keyword stuffed or filled with hype is OK. As for what category to submit to, typically the one where sites most similar to the submitter's site is the best.