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I haven't actually done it myself, but if the hole avoids the spiders and just lets the light pass between them, it would make the scope a "clear apperture", ie. it would behave more like a refractor and the diffraction spikes would dissapear, however, everything would be a lot darker and a lot less resolution. In some circumstances of bad seeing, stopping down may actually improve the quality of the image (so they say). The theory being that the bad seeing is produce by "blobs" of air, if the apperture is smaller than these "blobs", the image improves. Again I have never actually experimented with the idea, but I have seen some articles on it.
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