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That's an interesting question, and one that I've been discussing with some of my drag racing buddies.
The real reason for a longer swing arm is to lengthen the wheel base and move the center of gravity forward. The advantage to this is that it makes the bike much less likely to wheelie. Keeping the front end on the ground is very important in drag racing.
However, a single sided swing arm does not lend it self to the usual methods of swing arm modification. While it may be possible, I wouldn't recommend it. The fabrication process would be very intensive, and the end product would never be as strong as the original. Because of increased lever-arm torque on the axle you would get wheel twisting that would be very adverse to handling.
This is a problem that all single sided swing arms have to deal with. Triumph's solution works very well and doesn't affect stability. Lengthening the swing arm would just magnify the problems that the Triumph swing arm was designed to solve.
If you are serious about lengthening the swing arm, then you need to either fabricate a double sided swing arm, or find one from an early Sprint RS that is already double sided. (I think this will bolt in, correct me if I'm wrong) Then you can modify to your hearts content. There are a number of weld-in sliders available that will increase you're wheel base from 3 to 6 inches very easily.
Another possibility is to use a swing arm from a Tiger, which is already somewhat longer than the Speed Triple, and is also double sided. This should be an easy modification and would allow all kinds of lengthening options.
I can go into the various single sided swing arm modifications that we've talked about if you want, but it's fairly complicated.
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