Hi, although it could be done, to prepare all RC data for a file format would be a complex process.
Actually you can convert the RC objects to stand-alone instances, using RailClone Tools
The process is not destructive, because at any time you can delete the instances from RC Tools, and enable the RC object again.
As drawback, not all features are supported in stand-alone objects (Material change, UVW XForm, etc.), and Max doesn't perform well with tons of objects in the scene.
But it may be useful for many situations.
In any case, if you can send us a scene
with your RC objects, we may check it. I would like to identify what is causing the slowdown, and how to improve it.