Tabbing using cursor keys

Using the cursor keys, one can tab from one text field to another… until you tab into a radio button field; From there, the continous pressing of the cursor keys changes the selected option. This is so annoying because our users have a habit of using the cursor keys to tab from one field to another.

Apart from not using the cursor keys, is there another way around this issue?

P.S. Is there a way so that I can disable the tabbing via the pressing of cursor keys?