Interesting concept, but while taking away some of the damage it does, you're adding the effect of the elf (everybody's fav, no?) to it.
For me, in classic, it's really easy to move quickly and still maintain most of your energy all the time. With a good cap route it is a piece of cake to have almost all your energy when you're vulnerable, and that's without looking for routes that have that property which this method would cause people to do. I can't really speak for t1 as I didn't play enough to get very good at skiing but I imagine it goes the same there too. It would make it necesary for multiple snipes, interesting, I don't know how it would work, it would sure change things a lot tho.
The problem also isn't o-snipers, if using something on a different part of the field is a problem, then it's not the player that's the problem, it's the something being used. In this specific case though, choice snipes on their side of the map such as on LD who are a big threat (MDers, BBers) to your capper, ld who are about to snipe cappers, hofs that are almost dead, close chasers, last-second capper shots to save cap, etc are useful and not pointless, but sitting on a hill and sniping over and over at their lf is not likely useful because of the nature of the useful ones.
Also, as far as the "skill" aspect of sniping goes, there are 2 things that determine your ability with the rifle:
1. Your connection to the server and your familiarity with that connection.
2. How well you use a mouse.
If both of those are good for you then with a bit of warmup you can be a decent sniper, simple as that.
The other weapons in tribes require much more "skill" to use, even the chaingun, the rifle is the only one that it just point and shoot. While mouse skill is a very important thing in all FPSs, sniping "skill" pales in comparison to the other weapons so let's not sweat people and their sniping skill too much.