By simply not using it

, and relying on the ruler tool, the compass tool and the pencil tool.
at least thats how I navigate. There are different threads about manualnav on this forum. Use the search function.
or maybe you can have a go at deleting the entry for the cursor in the mouse.cfg file in the Data/Menu/MouseCurs folder. Backup the original in case it scrooze with your sh3 install
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If you have an apple and I have an apple and we exchange apples then you and I will still each have one apple. But if you have an idea, and I have an idea and we exchange ideas each of us will have two ideas. G.B.Shaw