The slider does have limited functionality due to hardcoding in this regard and we do plan to make the Slider render steps based on calculations.
These inconsistencies are worked around in the design of the configurator example itself. There is no mathematical formula used here so this example does not have equal distances between points as you have correctly noticed.
However, what you can do for now is take the example's image and edit the points so that they appear equal, and then give the slider the same steps in pixels.
If you cannot do this by yourself, please send us the image and we will do this for you.
Please make sure also, that you give us the exact distance between points.
the Telerik team