Polling rate is 1000Hz.
I can't say I'm 100% certain the mod is applied correctly because your guide offers the Steam version folder for extraction as its example, and I'm using the EA version. I extracted the DLL to the following folder. It's the only one that makes sense, and is the same folder where the game executable itself is stored. It's where the other DLL's are also stored (ex. ogg, OpenAL32, PhysXCooking64, PhysXCore64, etc.)
C:\Program Files\EA Games\Mass Effect Legendary Edition\Game\ME1\Binaries\Win64
I have not tested with a script. Shoot me the FAQ on how you want me to do that, and I'll give it a go.