As part of the input to the Hazard tool, as you are aware, you have to provide the Risk Category. If you select Risk Category III, the tool will report tornado wind speeds for 1700 year and the 10,000, 100,000 MRIs as you note. If you select Risk Category IV in the input, you will get a report of 3,000 year MRI, as well as the higher MRI wind speeds. You cannot directly interpolate the data to obtain the desired values. I hope this helps.