Full list of (currently undocumented) keyboard shortcuts:
Note: On Mac, substitute any ctrl with cmd
general:
ctrl+z: undo
ctrl+shift+z: redo
ctrl+s: save (open publish dialog)
ctrl+i or i: open info window
alt+r: open reply dialog (on a published markup)
tools:
v or s: select tool
a: arrow
m: marker
t: text
l: line
c or e: circle (ellipse)
r: rectangle
esc or ctrl+enter: finish editing a textbox
editing:
backspace or delete: delete selected shape(s)
ctrl+a: select all
arrow keys: nudge selected shape(s)
shift+arrows: nudge selected by 10 pixels
Pretty nice, and it's similar. But, no text tools, and no Safari/Chrome support. Also, MarkUp captures the DOM exactly as it is (including stuff loaded in through AJAX), and kills any javascript.
1) Yep. Keyboard only for now (though we're looking into adding UI controls): You can select any shape, then hit backspace/delete. You can also select every shape with ctrl+a/cmd+a. Also ctrl+z/cmd+z and ctrl+shift+z/cmd+shift+z to go back and forth in the history.
2) We've got some ideas about making collaborating easier (revision history, realtime multi-user drawing, wave-style replaying, &c.) What would work well for you?