While this not be directly considered in the guidelines, it happens often enough to be repeated (and this does apply to you, but don't take it personally: I'm emphasizing it because it applies to so many other people as well:
Do you want to be considered a spammer? It's very simple. You can do it anytime, anywhere. Just submit two different URLs for the same website to a single commercial category. That's all. I may not call you "spammer" to your face, but I guarantee I'll think it.
And, read the submittal guidelines as many times as you will, I also guarantee they WON'T say "pick the ONE BEST CATEGORY to submit several pages of your site to"!
Do you want to be considered a DECEITFUL spammer? Then use two different domain names for those two pages. Now not only do I think you're a spammer, I think that YOU know you couldn't get what you want honestly, and you're therefore trying to sneak it in. Again, I may not say it, but in my book you've earned the reputation.
And, finally [FTR, this part certainly doesn't apply to the website under discussion]: Those spawn-of-rabid-dogs that repeatedly submit every single page of a site to a category -- nothing vile that ever happens to them will be undeserved, nor can fail to cause great rejoicing among society at large.
I'll say it again: one entity, one topic, one listing. Any entity that wants more content visible from (and perhaps described in) its ODP listing has a real simple solution--they can link to anything they want: and "update URL" to add mention of significant new content, is allowed and even appreciated.) If you see any exceptions, I'd almost say "please report them as potential abuse."
There is one kind of legitimate exception that I know of, but it applies only to "highly valuable reference" domains. Project Gutenberg might have one listing in an author's category for each e-text of a book by that author; the Catholic Encyclopedia and similarly authoritative sources might under very unusual circumstances have multiple listings. Even in those cases, we'd prefer to link to, e.g, the "author index" on an electronic archival site, than to each individual work. (PG didn't have them, last time I looked.)