You don't need permission to make map, anyone can do it. Also, you don't apply for map dev. If you frequently make maps and create YML's, you'll be handpicked.
As it's been previously mentioned, you have to appeal for an unban (which you can do in the Appeal an Infraction sub-category under Policy, however I do not guarantee 100% success at becoming unbanned) and as PokerFace said, you don't require permission from anybody to create maps and/or submit them. Moreover, it doesn't matter whether you're banned or not, however, map making won't alter your chances of being unbanned whatsoever. If you wish to make a map with someone, I advise you use Skype to contact others just to avoid spamming the forums.
Question has been answered, thread is going off-topic, so...
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