Not sure I understand what you get with POP that's different from IMAP. However, maybe this will help:
Originally Posted by T3CK
When in the e-mail app, you should see a "favorites" section, as well as a "Gmail" section. Open the "Gmail" section by tapping the arrow. Inside, there will be: Inbox and Outbox (these are Pre folders that get mapped to Gmail folders, more on this later), as well as [Gmail] and its subfolders (All, Drafts, Sent, Spam, Starred, Trash), and then each of your GMail labels (GMail doesn't actually do folders).
For those folders you care about, tap the star until it turns yellow.
Then, close the Gmail section by tapping the arrow. Your folders will now appear in the Favorites area. No need to see the [Gmail] heading.
If, for some reason, Inbox/Outbox/Trash aren't mapped corrected, you can: Preferences & Accounts, Gmail, scroll to "Default Folders" and make whatever changes are needed.
I'm guessing that you don't like using Favorites (because you want to see only one accounts folders at a time) and you don't like the fact that GMail has so many "system" folders? Is that it?
Anyway, I see from another post you've made that you figured out why this is happening. Now that you mention it, this makes sense. At least within the Pre's paradigm. Specifically, the Pre's e-mail client is based on the idea of syncing. POP and syncing do not go well together. Palm clearly was trying sort hard to make the new paradigm work that they didn't realize it wouldn't work well with the "old" way of doing things (POP). Maybe they will fix this in a future OS release.
Ultimately, however, this is one of the benefits or flaws (depending on your perspective) of the cloud-based approach used by the Pre. Things sync (IMAP), they do not download (POP).
Ultimately, some will find that this new approach to things does not work for them. That may be the case for you. In which case, a device that well supports POP would be a better way to go.
I've said this elsewhere: if you're a serious e-mail user, a Blackberry is a much better way to go.