Would be nice if it gets officially supported, since its the only way that i know of that you could do OpenCL+CUDA Rendering in the same system at the same time both in 2.79 and in 2.80, which is something others have asked if it was possible in Blender before.
Here are some screenshots of test benchmarks i did with CUDA+OpenCL running at the same time:
http://i64.tinypic.com/2lwwrpl.png
Test Results with Tile size of 512 on both the GTX 1060 6GB , RX470 4GB and manually set load ballance of 55% for the 1060 and 45% for the 470 (6.24s) :
http://i67.tinypic.com/qqef6s.png
Would like to test if it was possible to do Hybrid Render (CUDA+CPU) + OpenCL in Blender 2.80 Beta using the same trick, but as of right now i cant seem to install crowdrender addon (cr_016_bl280_c) in the latest version of the 2.80 beta, would always get an error like this:
http://i66.tinypic.com/1z3ymma.png