Yes, this is an email friendly cart design, which wouldn't include form buttons.
The display manager isn't re-entrant. After running the wizard you have to make updates using Dreamweaver or basically you would be overwriting and re-generating the cart from scratch. It remembers the settings from the last time it was applied but can't work for inspecting and editing a previous application you are basically overwriting it if you run the wizard again.
I'd suggest getting a backup of the cart file ( I think you have one attached to a previous forum thread here) and then tell me what you are trying to change and I can walk you through making the necessary updates outside of the wizard.