Rob,
Other than “Normal”, it’s possible to pan the map in “Modify” mode. I guess you mean panning in “Draw” mode. Please think about it, if you want to pan map in “Draw” mode; how can we judge the mouse action in different mode? They are conflicted.
My recommendation is that add a shift key support for panning; for example, when shift key down; set the mode to normal on the client side while restore to draw mode when mouse up.
To click and release to draw line or polygon is hard coded which is another drawing action and we don’t support currently; it’ll spend us much time on adding this new feature. So I don’t think we’ll support it in the near future.
Please let me know if you have any questions.
Thanks,
Howard