I just ran into a situation today where more control of the random seed would make all the difference. I'm using splines to distribute automobiles on a road and in parking lots, so it's covering quite a large scene. However, whenever I make a small tweak to just one of the segments, the whole scene reshuffles, so it is very difficult to have any control over the placement of vehicles. There are probably other situations that would benefit over greater seed control, but this is one that has significantly impacted my workflow.
Thoughts?