Thanks for contacting us with this question. Although the evenly segments are at fixed intervals you may find it is possible to achieve something similar using the Compose or Sequence operators in conjunction with the arithmetic operator attached to either a segments padding to create spaces, or X Size parameter if you want to scale panels.
In the top example we have a exponential spacing created y multiplying the current segment count by a distance : SegmentXCounter*Input1
The bottom example is an example of using a Sin function to create the spacing. This expression uses the segments position on the spline, measured from 0 at the start to 1 at the end, to create the spacing: sin(XSplinePosition*180)*Input1
In both cases the graph is the same, with an arithmetic operator used to control the size of the panel segment, just change the expression in the Arithmetic node to get different effects.
You may also find this post
helpful as it goes over some of the variables built into the RC expressions editor.
I've attached a file for you to take a look at, please let me know if you have any questions.