Developer HenBagle has released a mod that completely removes mouse acceleration from the remaster of the first part of the Mass Effect trilogy. This means that the mod is only available for the Mass Effect Legendary Edition, not the original version.
According to the modder, to disable acceleration and the EnableMouseSmoothing parameter, which is responsible for smoothing the mouse, his work changes the scenario of the game’s movement. In addition, it is compatible with most other LE1 mods as it uses a new merge format to make changes.
You can download the mod here. To install it, you will also need to download ME3Tweaks Mod Manager version 7.0. After downloading, you just need to drag the .7z file into the Mod Manager window, unzip it and install it.
And as a bonus – here is a mod that fixes the camera throughout the trilogy. The work of the Jade modder changes the FOV in the game to whatever value you want.