The Coleman 424 model isn't really a dual fuel burner, I really wouldn't want to use anything other than Coleman white gas with it. I would basically rule out the possibility of using unleaded petrol with the Coleman. Using petrol is a last resort measure and quite a dangerous one.

For a Kerosene double burner the OptimusŪ 155W Kerosene cooker or the OptimusŪ Double Marine Stove might be worth looking into.

http://www.sportsmansguide.com/net/cb/optimus-double-marine-stove.aspx?a=713474

For a portable LPG stove the Primus Oden Stove Stainless steel might be worth a look. A campingaz 907 butane refillable bottle can be used carrying around 5lbs of LPG. These are mostly used in European countries though.

Coleman also have their 1lb propane bottles for there dual burners.

http://www.coleman.com/coleman/ColemanCom/subcategory.asp?CategoryID=2010

I don't really think that there is a true multifuel dual burner available i.e. such as a dual Primus Himalaya Omnifiel. i.e. burns Kerosene, LPG, Coleman White gas, Unleaded Petrol and Diesel.

Probably best to stick with a propane or LPG gas dual burner. They are easy to set up and burn clean and are generally safer in use and to store.