This isn't an answer, but u could try getting the mouse position using
get_viewport().get_mouse_position() and multiplying it by a factor in
_process like this
var m_pos = get_viewport().get_mouse_position() * factor
var whateveryouwanthere = m_pos
that might work, but make sure not to set the mouse position to
_process because that would multiply exponentially every frame. Just set the position of whatever object you want to display (probably the cursor) to
Hope this helps!