Can the tab order be changed, so once an email has been typed, we can tab once then hit space?
Most email clients have the tab order set so you can quickly submit it without having to take a hand off the keyboard then scroll down with the mouse (to get the bottom of the reply pane in view) then click the reply button. Eg, one single tab then you can space over the element that has focus. Currently the element that has the focus after the reply pane is the close button.
(in fact, there is already an X in the top right - there shouldn't be a need for a close button next to the reply button!).