You can wire a manual switch or replace the existing factory switch with something that turns on earlier.
http://www.motowheels.com/italian/myProducts.cfm?parentcategoryid=8%7CEngine&productID=2220&showDetail=1&categoryID=16|Ducati%204%20Valve&vendoridtodisplay=0&filterFor=&collection=168%7CEuropean%20Motorcycle%20Parts
These are available for the 748-996 and the 998.
http://www.motowheels.com/italian/myProducts.cfm?parentcategoryid=8%7CEngine&productID=2220&showDetail=1&categoryID=16|Ducati%204%20Valve&vendoridtodisplay=0&filterFor=&collection=168%7CEuropean%20Motorcycle%20Parts
These are available for the 748-996 and the 998.