Hi Studio1,
Please provide a sketch what you need, perhaps a combination out of Sweep [NURBS] and Spline Wrap might be the solution. Your question is too general to give a answer that might work for the target you have in mind. No idea if there is something, but lets have a look… The new R16 has an improved UV support for caps, which allows for a much better control of “cap-displacement”, but there is a limit. Another way would be to create a cap that comes close, and use the Extrude [Nurbs]. Then link it to an Connect Object (use the link field, do not parent it. Under this Connect Object goes a Correction Object. This allows you to “model” with the given points.. This is a fragile set up, do not change too much. This can go again in a new Connect Object, or in an Instance object, to be then deformed by the Spline Deformer. (The objects need to be in the sequence—in the Object Manager—as they appear here, top to bottom/hierarchy based. Again the last one is fragile, but with point selections at step two (Correction Deformer) it becomes kind of manageable. There is more to it, to get acceptable results, but this is on a case by case discussion. So, show up with a sketch, before we continue.
Happy New Year.