-noforcemaccel - Copies the current windows values for mousethreshold1 and mousethreshold2.
-noforcemspd - Copies the current windows values for MouseSpeed, "Enhanced Pointer Precision (EPP)". If disable in windows, it'll be disabled in CS.
-noforcemparms - When used by itself ensures both MouseThreshold# and MouseSpeed windows settings are copied.

This is what you'll get by only using -noforcemaccel if Enhanced Pointer Precision (EPP) is disabled in Windows.
- MouseThreshold1: 0 - MouseThreshold2: 0 - MouseSpeed: 1 SpeedValue: 10 (default pointer speed slider value)

Note: MouseSpeed: 1 means Enhanced Pointer Precision (EPP) On.

The source code always initializes EPP on by default without any launch options.
static int originalmouseparms[3], newmouseparms[3] = {0, 0, 1};
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Full Source Code:
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Info about mousethreshold1 and mousethreshold2
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You can verify this is occurring with this script which uses the Windows SystemParametersInfo function to get the state of the values.
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