If you are currently drawing a polygon, make a key (possibly "Enter") automatically close the polygon (without having to manually click back on the first point) and bring up the label entry dialogue.
e.g. drawing a quad could be 4 aimed clicks, then press 'enter', instead of 5 aimed clicks.
also make 'esc' a hotkey to cancel the whole thing, and 'del' a hotkey to remove the last point.
If you are currently drawing a polygon, make a key (possibly "Enter") automatically close the polygon (without having to manually click back on the first point) and bring up the label entry dialogue. e.g. drawing a quad could be 4 aimed clicks, then press 'enter', instead of 5 aimed clicks.
also make 'esc' a hotkey to cancel the whole thing, and 'del' a hotkey to remove the last point.