Hi
I don't know if there is a way to do this automatically, but for a given plot you can set the tics to be whatever you want. Here' the example:
set xtics ("low" 0, "medium" 50, "high" 100)
For your plot it would be something like
set xtics ("1^{-10}" 1e-10, "1^{-9}" 1e-9, "1^{-8}" 1e-8, "1^{-7}" 1e-7, "1^{-6}" 1e-6, "1^{-5}" 1e-5, "1^{-4}" 1e-4, "1^{-3}" 1e-3, "1^{-2}" 1e-2, "1^{-1}" 1e-1)
Note if this is too cluttered you can do just odd or even or whatever:
set xtics ("1^{-10}" 1e-10, "1^{-8}" 1e-8, "1^{-6}" 1e-6, "1^{-4}" 1e-4, "1^{-2}" 1e-2, "1" 1)
Just make sure when you set your terminal you set "advanced", as I don't think superscripts work otherwise (might be wrong though).
Best
Gavin