Market order with offset?

I'm using IB and like the speed of market order but would prefer an offset so that my order fills a bit slower but with slightly better price. Is there such a thing?

For example, market buy at the ask - 1 cent or market sell at bid +1 cent. It would be similar to a rel order but won't fill if the current spread moves.
 
I believe you'd need a limit order for that. Market orders are just that...Best price you can get at current market, which may not be +/- 1 tick from your desired fill.
 
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