In Draw, alt centres an object but also overrides snap. Can another key be assigned to one of these?

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Alt has a double function here.

1. Choose menu Shape - Insert - Basic Shapes - Arc.
2. Drag from the center point of the final arc (without Alt) until reaching the desired radius, and release the mouse button (you will get an ellipse half the expected size of the arc).
3. Press Alt and move the mouse (and you will get the ellipse in the expected size).¹
4. Continue your work.

Tested with LibreOffice 6.4.7.2 (x86); OS: Windows 6.1.

¹ If you release Alt at this point you will get the ellipse at the original half size. Could press and release Altas many times as you want; as soon as you move the mouse, the ellipse size will change.

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