I have lately been wondering if it wasn't smart to have RC Global Variables?!
Here's an example. A room, - here it would be great to have the general measures for the room in a global variable that all railclone inserts could make use of, such as Room Height, Door Height, Windows Height, Windows Sill Height ect ect. Yes, you could gather all building components in one RailClones setup, BUT it lacks flexibility and would end up being unnecessary heavy. It is, in my book, way better to have things split up in smaller manageable and logical parts sharing the same spline path.
RC could have an insertable avatar holding the global values and all other RC setups could make calls to this avatar.
Just an idea, - I for sure miss something like this.