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Not without a major rewrite, and then the cross hairs would not stay centred when you changed the spacing. The command used to draw the cross hairs requires integer input. ATM spacing of 0 give a single line, 2 gives a gap of 1 between the two lines, etc.
To rewrite, would mean having to work out whether the spacing is even or odd, then offset each line by a different number (say, 5 and 6 for a spacing of 11) and the odd spaced cross hairs would not be concentric with the even spaced ones - they would be shifted by 1/2 a pixel.
Even if the commands could handle 1/2 pixel plots, any angled lines would be OK, but any orthogonal ones (vertical or horizontal) would display as double width anyway, so you're back to 3 being the same as 2 with a thicker line.
I don't think there is any real gain to be had in terms of accuracy.
Al.
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