Same here, no effect on rwr_config(still displaying only my HD4000) after doing things with Inspector

SOLVED
I just discovered that RWR is actually using my discrete 620m!!!.
While it is not shown in rwr_config, if i trying to launch game/config by explicitly selecting Nvidia GPU from context menu, that Nvidia Inspector sensor monitoring graph clearly displaying GPU utilisation and rising of temperature.

Also there is a minor difference in log files when using different GPUs, namely "D3D9: Vertex texture format supported" list, which contains twice as much formats when game is running on Nvidia. That aside, both logs and rwr_config saying that game is running on integrated Intel GPU, looks like they just lying in one case

Sounds weird, but goot it's working for you!

Doesn't work like that for me tho.