* Smooth strokes can now be drawn again, with normal (i.e. reasonably speedy feedback again).
Previously slow drawing was caused by a bad notifier being used - the full screen was redrawn each time instead of just the relevant region. Now, only the relevant region is redrawn while drawing, and a proper flush is done for the rest of the screen at the end.
* Made drawing straight lines a proper drawing 'mode' for Grease Pencil now. Use the Ctrl-D-LMB hotkey to draw straight lines in this way. The (buffer) line drawn now will accurately represent the final straight line instead of drawing the freehand path taken as before.
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