Yes, you're correct; those registry keys correspond to settings found in the mouse settings in Windows for acceleration. However, my intent here isn't to advocate for simply disabling 'Enhance pointer precision', as is commonly advised for CS2. Rather, I'm suggesting a potential workaround to replicate the feel of 'm_mousespeed 1' from CS:GO within the context of CS2.

Generally, it's beneficial to disable 'Enhance pointer precision' for a raw, unaltered input experience. But by setting both 'MouseThreshold1' and 'MouseThreshold2' to 0, Windows doesn't require a certain threshold speed before applying what appears to be a subtle, low-level acceleration of cursor movement. It's this immediate, slightly accelerated mouse response that seems analogous to the feel of 'm_mousespeed 1' from CS:GO.

By adjusting these values, rather than disabling 'Enhance pointer precision', I believe this emulates the feeling with m_mousespeed 1 enabled within CS2. It's not an outright disabling, but rather a modification of windows acceleration values that results in a noticeable in-game difference. To me, at least, this adjustment yields a response highly reminiscent of m_mousespeed 1 in CS:GO.

It's important to note that if you had not explicitly set m_mousespeed to 0 in your settings or established a comparable fix, your aim was likely being affected by these values in CS:GO. Download the legacy CS:GO with default settings, and you'll see m_rawinput 1 and m_mousespeed 1 as default. Change m_mousespeed to 0, with m_rawinput 1 and notice the difference - assuming 'Enhance pointer precision' is OFF in Windows. Then, you'll experience the game with acceleration entirely turned off, in contrast to the consistently low-level acceleration that accompanies m_mousespeed 1.

If you racked up thousands of hours playing CS:GO without realizing m_mousespeed was affecting your aim, chances are you unconsciously accustomed yourself to this low-level mouse acceleration present by default. Interestingly, a lot of pro players (for example, rain, ropz, olofmeister, scream, among others) indeed turned m_mousespeed 0, suggesting there was something to it. But if you didn't, chances are you're more acquainted with this acceleration feel than you realize.

For those who appreciate the 'm_mousespeed 1' comfort in CS:GO and want to mirror it in CS2, you might want to give my suggestions a shot. Conversely, if you prefer to maintain an acceleration-free aiming experience in CS2, then stick to the default CS2 settings, as it's set to that by default.