FX Editor - select range, shall start outside the grid

Hello everyone,

editing FX Curves sometimes is realy hard. Fetching all the points on the Edge of a grid, while i can't use the Shiftkey to select multiple.

I would love to start with the selectionbox outside of the Grid.
Currently, if the cursor moves out of the Grid, it is no longer on selection-option.

For better understanding here are some Pictures.

Current observation:

Cursor changing in the Grid 

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Cursor also change outside the grid (even with selection still in process)

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And here is what i Wish for:

The difference is the Cursor.

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To make clear where the selectionborder is, a second (maybe dotted) border could be added, like in the next Picture.