Quoddy,
Non-traveller designs can be sailed efficiently with the use of the vang. To produce say a heavy air setting, vang down to straighten the leech and ease the mainsheet which effectively is like dropping the traveller. The other extreme, light air, ease the vang and sheet the main enough to pull the boom to the windward. It is more difficult to optimize sail trim in light air. The 260 doesn't respond well to the boom beeing pulled all the way to the weather anyway so a traveller is just in the way. Larger keelboats can deal with that better because they have inertia to keep them moving when puffs die off. You might be able to optimize trim faster with a traveller but good results can be had without. Many if not most performance dinghy classes doe not use a traveller.