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this is (partially) possible: you can create objects and
connect them in an "invisible" canvas. you can delete
(clear) the entire canvas.
the only thing that is not possible (afaik) is to delete
selected objects (at least, selecting is not possible since
it is emulated via mouse movements)

if deleting of specific objects would like connecting (by
giving their enumeration value) then i think, this feature
would be fully implemented.