Hi Hitman,
to avoid possible problems, I have already taken care that the random radii (???) do not overlap. At the moment the random radius is max. 20% of the max. distance you specify (in an extreme case the distance between the waypoints is only 50% of max. distance, two waypoints ===> roughly 20% of specified max. distance. I guess this is enough randomness). Usually, the random radius is equal to the distance of the waypoint from the main course axis (but, as I said, max. 20% of specified max. distance). These things however can be easily tweaked.
Another thing I had to tweak was the loop feature. At the moment I have just disabled looping to other waypoints for the zigzagging units (obviously, the waypoint counting is changed). I don't know yet how serious this is for the gameplay.

In general, I think this tool can easily change the whole style of playing, no easy 90 degrees shot after shadowing a straight-running merchant for some time

Try to catch/shadow a 12kn merchant at 16km distance that changes course every 2-2.5 hours

I guess that will be a really tough game
Concerning the tool you are mentioning: I am not sure whether I understand it. You want a tool that takes several RND/SRC layers and merges them to a single layer (doesn't the editor have such a feature

)? Anyway, such a tool should be quite easy to program (on the first look).
Cheers, LGN1