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Is it forbiden in Germany? I do not know.
It is NOT forbiden because of a rule at eBay. It is OK in the States and most other parts of the world. If you are worried about it, increase your lead time to 15-30 seconds. Make sure 'instamail' is turned off. Then there is no way to know if you stayed up to bid manually, or used AuctionSniper to bid for you.