Make gradient swatches global
Gradient swatches should be globally applicable. This would mean they´d need to be editable - either in Swatch Options just like other swatches or replacable by dragging a altered version of a gradient onto the old swatch. (At the moment, the only option is the swatch title)
Emily Rose Lacy-Nichols commented
Hey, the following might help as a workaround, if anyone else is waiting for this feature.
In Ai CS6, you can do the same Alt+drag technique using either the "fill" or "stroke" box in the Gradient Palette (instead of an actual swatch from the Swatch Palette). This way, you don't have to create a new swatch for the altered gradient before Alt+dragging it onto the old swatch. Only saves a few keystrokes or mouse clicks, but they do add up.
(BTW: I second the request that gradient swatches be made global.)