It would be really cool if the plot widget had a “Freeze” button that greys out the current curve and keeps it. This is found in other tools like circuit simulators and is often very handy.
Thank you 
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Thank you for your suggestion, we will keep it in mind when deciding on which features to implement next!
In the meantime, if you want to experiment with adding a custom widget yourself, you can do so using the Custom Function module: CustomFunction - SweepMe! Wiki