Figured I'd post this for anyone who wants it...
I've always preferred the stock Email app in lieu of Gmail because it supports multiple POP3 accounts, but wanted the features listed in the post title... so I added them.
Also, fixed the issue with emails with attachments getting marked unread if you don't download the attachment.
I've been using this on my Droid X and Droid for some time now and it works great, solves all the issues I had with the Email app. It's been used in a couple roms to date (Tranquility, and Bugless Beast), but I'm not sure if the latest versions are still using it.
At any rate, the apk is attached... you'll need to remove your current Email.apk (and Email.odex if applicable) before installing. If you get an install error, just throw it into /system/app and reboot. You'll have to set up your accounts again, the new options are in the menu.
I have no idea how/if it works with corporate/exchange accounts.
Also, the source can be found here: http://github.com/dustinmj