What I would love to see is this:

Ability to create Personal Points of Interest based on locations that I have personally researched.
Ability to see these on any route or new routes.
Ability to turn off individual items (as implemented in POI / Manage tab)
Ability to see points at any zoom level, or selected zoom level. I saw this in another user's comments.
Some tagging or sorting so that I could filter for things such as location (US state) or type (Hotel)
Available text fields for comments ("Great BBQ!) and hyperlinks.
Import and export, such as the CSV feature in the current POI implementation.

That's all, and I now promise to stop posting on this topic!
Thanks for your consideration.