If you have two tangents in Civil and you want to adjust one tangent with a fixed percentage value, then the station-value is always kept as a fixed value. However, it would be nice if you could "detach" the stationing and adjust the stationing by entering the percentage value. In my example, I want the right tangent to have a percentage value of 3%, and let 1% for the left site:

I.e. the right tangent would be adjusted in the direction of the yellow arrow (direction of the left tangent) on the percentages against the left.
The input in percent could work e.g. via the dynamic input.