Not with our COM (3DxInput) API. You can get more information by using the HID API, or the old 3DxWare Win32 API.
Even so, the data can be scaled by the user to outrageous values by clever manipulations of the config files. The best thing for you to do is assume that values will be +/-500, then clamp the values at that point if it would cause a problem in your code to get anything outside that range.
That still allows the users to change the slope of the data w/o blowing up your code.
3Dx Software Development