According to pgfplots manual it is possible to enlarge axes limits using enlarge x limits and enlarge y limits properties. One can specify relative and absolute values, but they are in units of the axes. Is it possible, to enlarge limits by some fixed distance, e.g. 1cm?
If possible, I would need a solution, that could be defined in the .style property, as I would like all my plots to have axes extended by the same value.