There was, of a sort. A feature called ‘Lumen Direct Lighting’ was created when 5.1 was in development, and my understanding is that it basically uses lumen’s screenprobegather to handle all direct lighting. In the original CL, their numbers showed LDL to be significantly cheaper than VSMS, DF shadows, and even traditional shadowmaps in some cases, but the quality was abysmal. Because it only worked with SWRT, you got blobby, temporally-unstable shadowing that tended to miss important features, but it was dirt-cheap.
As of 5.1.1, lumen direct lighting is nonfunctional (just tested), but the command still exists:
