By what I experience in an assymetric sketch, inserting a sketch from a file or from a pallette initially places the white positioning handler in the center of the sketch, but only if there is an element such as a point or centerlines throuch that center. If no element is found in the center of the sketch, the handler seems to snaps to the element nearest to the center of the sketch.
A new sketch on the palette is a L-beam, which we preferrably position by its 'angle point', and where the center of the sketch is of no practical use.
A predefined position of the positioning handler on the sketch would provide a functionality similar to component interfaces, and would avoid repositioning the handler every time the sketch is used.
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