I'd prefer the default action for the button to be "accept without comment", with a combo dropdown to specify a a comment.
The current behaviour of the RSVP buttons is very un-mac-like. context menus should not appear when you press a button unless that button is clearly a drop-down menu button.
The "view source" option is currently buried in a context menu when user click on an email. This option should be unhidden by adding it to the "Message" menu and/or add to the Ribbon when viewing an email (in any window type).
I'd like to add a bit more to this Feature Request:
Please enable ribbon/toolbar customization:
1. Add/Remove buttons;
2. Option to Use Small Icon;
3: Option to view icon only;
4: Add hover text option to describe the button and also show any assigned keyboard shortcuts.
The ribbon takes up too much space, but I don’t want to hide it entirely. it would be more useful to me if there was a “compact” option. I don’t need to see the button text if I already know what the button does, and having the text (and shortcut key) appear when I hover over a button is more than good enough for me.