Specifically as it relates to the slider in the toolbar; as I’m using it right now. Some of this might apply to the slider element too / some might have been implemented for it already.
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Have wanted a range option for a long time Ex: https://jqueryui.com/slider/#range
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Add an event that continuously reads the value as the user moves the slider(s) so that other actions can be programmed upon value changes.
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Add an option so the slider snaps to increments. Example: Years from 2010 - 2015; it’s natural to jump between whole years.