A sticky thread/topic could address the sub-forum specific rules for developers.Part of the problem is that the four "Apps" forums have a separate set of rules that apply to developers. That's one of the major reasons we've decided to group all third-party software together in one section rather than splitting them up as sub-forums of hardware forums.
There's also the issue that while "iPad Apps" could very logically go under "iPad" as you suggest, would you put "iPhone and iPod touch Apps" under "iPhone" or "iPod touch"? And how about "Mac Applications"? Not to mention that "Code Sharing and Software Promos" is related to all three other application forums in that section.
So, yes your suggestion is certainly a good one for the iPad Apps forum, but it creates problems when considering forum organization as a whole, and that's why we ultimately decided to do things the way we did.
As for where the iPhone and iPod Touch apps sub-forum would go, that's a toss-up... separate app forums for each or leave the current one where it is. As the sub-forums are set up now between separate iPhone and iPod Touch sub-forums, there is going to be confusion or duplication anyways as people post an issue in one forum that is also applicable to the other device.
But I understand the need/desire to keep things consistent.
Alternatively, would it be possible to provide a symbolic link within the iPad sub-section that redirects to the separate iPad Apps sub-forum? (depends upon the forum software being used)