alt click swatches to add colors to a selected gradient
With a gradient object selected, it would be much quicker to alt click swatches from the swatch panel to add to current selection
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I think you meant 'to insert them into the active gradient with no actual stops selected', correct?
Ai today allows to convert selected swatches into a gradient via the panel’s menu, Create Gradient. It would replace all the gradient stops though, not insert them in between. I know the only plugin that allows actual inserting like you mention, Gradient Forge. -
You might want to vote for this request:
https://illustrator.uservoice.com/forums/333657-illustrator-desktop-feature-requests/suggestions/44802625-when-gradient-tool-is-active-make-holding-alt-swi — When Gradient Tool is active, make holding Alt switch to Eyedropper tool