Additional Selection Tool
The current selection tool is excellent for re-using areas of a drawing, often eliminating the need to draw objects repeatedly across many frames. I would not like to see the way this tool works changed, as it is great for many tasks.
However - an additional selection function, whereby the selected area would remain selected (marked by a dotted outline) would be VERY useful. So that one could select an area that could then be cut, copied, filled or cleared and this area would remain selected even when a different frame was selected. This would allow one to work on a specific area across many frames. An invaluable feature in hand drawn animation. The selected area would only be de-selected when a dedicated deselect button was clicked.