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Why are you doing any of this? That launch arg just calls the WinAPI SystemParametersInfo() Get/SetMouse which is how applications control the windows mouse / EPP values if they want to, and it's storing existing values that it then first checks on init. So in other words, you are manually editing values in the registry to some value you think is going to do something for you, and then asking the game to call that and store it in a variable to use on init. I am not surprised if it breaks something with the cursor. https://github.com/ValveSoftware/source-sdk-2013/blob/master/mp/src/game/client/in_mouse.cpp#L262 The default Windows setting is to have EPP enabled, maybe why the convar m_mousespeed has been chosen to be set to default = 1? but this doesn't affect Raw Input in any case. None of those relate to the function for the raw input mouse event accumulator which overwrites the *mx / *my variables with raw input data if m_rawinput = 1 https://github.com/ValveSoftware/source-sdk-2013/blob/master/mp/src/game/client/in_mouse.cpp#L331 The order the functions are checked / applied is then here - you can see for GetMouseDelta() function the first two args are the passed-in raw input deltas. https://github.com/ValveSoftware/source-sdk-2013/blob/master/mp/src/game/client/in_mouse.cpp#L663 It checks for it's own filtering convar at that point - which defaults to 0 at the top of the file in case you were also worried about that, before passing out the output https://github.com/ValveSoftware/source-sdk-2013/blob/master/mp/src/game/client/in_mouse.cpp#L368 All you need to do in CSGO is set m_rawinput 1 and m_customaccel 0 if you don't want to use either the in-game accel or Windows EPP / WPS settings. There's no reason to enter any other convars or worry about anything else. It matters not one jot that Enhance Pointer Precision is enabled or not (m_mousespeed = 1) when the game is calling Raw Input.

Assuming you like how MW scales the ADS, correct. Apex defaults to the same method. You can increase the FOV and match the sensitivity to MW using either 360 distance or MDV 0%, which one is best is mostly down to what you prefer. For the ADS and scopes, if you want them to match MW you will need to change them if you change FOV, using the calculator and MDV 0% will tell you what to configure