First post. Love Smartsheet! 
Did some searching, but came up blank.... I'm typing away managing my first big project in Smartsheet and am adding a lot of comments.
I'm clicking the mouse to bring up the Comments dialog. At least I can <TAB><SPACE> to tab to the post button. You're already doing better than google in terms of acknowledging the keyboard.
Is there a shortcut key to bring up the dialog? I know <ESC> closes it.
Thanks and keep up the great work!