Are you referring to the aiming reticle, or the pointer when you're in free look mode? If it's the reticle, then I may be able to help you - check out my Combat Reticle add-on. Currently lets you customize the reticle for better visibility. You can't currently increase the size, but that may be a feature that I can add. I'm currently making some changes to it and will release a new version soon.
-A
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